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EDS and Brain Fog

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Quick answer

With EDS, brain fog often appears alongside problems in your body's structure and automatic controls. You may feel worse upright and have pain, fatigue, gut issues and unclear thinking.

Evidence consensus

Moderate-High - 2017 classification; diagnosis is clinical for hEDS and often specialist-supported

2017 EDS International Classification; NICE referral criteria

reduced cerebral blood flow upright (Novak 2025)
79%
also meet fibromyalgia criteria
56.5%

No

molecular test establishes hEDS

Treatable

once diagnosed

Sources: 79%: Novak et al., Am J Med Open 2025; 56.5%: Fibro overlap, one clinic (Fairweather et al., Front Med 2023)

One hEDS study: 79% had reduced brain blood flow

A 2025 study of 270 hEDS patients found 79% had reduced brain blood flow while upright and 33% met POTS criteria. That doesn't prove your brain fog comes from reduced blood flow, and anxiety can coexist. If standing worsens symptoms, ask your doctor about standing tests.

Novak P et al., Am J Med Open, 2025 (PMID 40843452)

Investigating: I think EDS might be causing my fog

Quick Answer

EDS Is Only Part of the Cause

With EDS, brain fog rarely comes from connective tissue alone. It may come from a mix of pain, dysautonomia, poor sleep, neck strain and the overall burden of living in an unstable body.

A 2025 study of hEDS patients at an autonomic clinic found 79% had reduced brain blood flow while upright and 33% had POTS. If standing worsens brain fog, ask your doctor about standing tests. Anxiety, sleep, pain and other common factors can play a part.

Sources: Novak et al., Am J Med Open 2025; Ross et al., Clin Auton Res 2013; Sousa et al., Brain Behav 2025

30-Second Screen

Are you hypermobile?

These 5 yes/no questions (5PQ) are a validated first check for hypermobility (joints that bend further than usual). If you score 2 or more, hypermobility is likely (84% sensitivity, 89% specificity), so keep reading.

The 5PQ (Hakim & Grahame 2003) takes about 30 seconds.

Can you now (or could you ever) place your hands flat on the floor without bending your knees?
Can you now (or could you ever) bend your thumb to touch your forearm?
As a child, did you amuse your friends by contorting your body into strange shapes or could you do the splits?
As a child or teenager, did your shoulder or kneecap dislocate on more than one occasion?
Do you consider yourself double-jointed?
0/5 yes
Signs

Symptoms that make EDS relevant

Use these signs to decide whether to get checked for hypermobility. Then use the sorter to pick what to test first.

With EDS, brain fog often comes from several problems at once.

Positional worsening: brain fog gets worse with long periods standing or upright, and often partly clears lying down

Pain-linked cognitive load: thinking can worsen on high-pain days

Daytime build-up: thinking may worsen as upright time, pain, poor sleep, medicine effects and gut trouble add up

Mast-cell-type flares: sudden brain fog with flushing, hives, gut or throat symptoms, or reactions to triggers can justify seeing an allergist

Sources: Novak 2025 ; Sousa 2025

Signs

When it gets worse

Look at the symptoms you notice and when they flare. Together, they suggest which cause is worth testing first.

  • In EDS, morning brain fog can vary with poor sleep, pain, overnight joint strain, symptoms on standing up, or neck symptoms.

    Common

  • Post-meal brain fog in EDS can suggest POTS or a gut cause, especially when meals, upright posture, nausea, bloating or dizziness happen together.

    Common

  • If activity worsens brain fog, consider delayed crashes, pain flares, unstable joints, heat intolerance and upright symptoms before blaming low fitness alone.

    Common

  • Normal routine labs do not rule out hEDS, HSD, POTS, pain, sleep disruption, or GI/nutrition contributors.

    Less common

Worse in the morning

Symptoms often worsen after standing, long upright periods, pain flares, poor sleep or neck-heavy activity, not only after meals.

After-meal worsening

Many people describe clearer thinking when lying down or after unloading the neck and body, which helps separate this from mood-only causes.

Worse after exertion

Symptoms often build through the day as pain, upright strain and tiredness from steadying joints grow.

Patient language examples

In their words

  • "Brain fog worsens when my body feels unstable, painful, or hard to hold together."

  • "Standing, heat, or upright time often worsens the cognitive part too."

  • "It shows up alongside dizziness, palpitations, flushing, gut issues, or weird allergic-feeling reactions."

  • "Pain and physical compensation seem to drain my brain as much as my body."

Common phrases

bendy body foggy brainmy joints are unstable and my brain feels unstable toobrain fog with hypermobilitymy thinking is worse on high-pain dayseds brain fog

Key takeaways

  • EDS brain fog is rarely from connective tissue alone. It usually makes more sense to find which cause is active and test for it.
  • A 2025 autonomic-clinic hEDS cohort found 79% had reduced cerebral blood flow while upright and 33% met POTS criteria. That supports standing tests when brain fog reliably worsens upright, but not POTS treatment for everyone with hEDS.
  • Fluids, salt, compression, exercise and medicines treat POTS or symptoms from being upright. Plan them with your clinician.
  • Hypermobility-informed PT usually favors stability, strengthening, body awareness, pacing and joint protection.
  • If burning, tingling, numbness, sweating changes or unexplained pain fit your history, small-fiber neuropathy can be worth raising.

Sources: Novak 2025 ; Raj 2020 ; Tinkle 2017 ; Sheldon 2015 ; Palmer 2020 ; Russek 2022

Active Debates

What's still debated

Neck instability (CCI/AAI): real but overdiagnosed

CCI is real for some EDS patients, but the evidence base is thin and diagnostic criteria are not standardized. The radiographic parameters most often cited are the clival-axial angle (CXA; Henderson and colleagues: normal about 155 degrees, potentially pathological at 135 degrees or less), the Grabb-Oakes (pBC2) measurement, and the basion-axial interval, often read on flexion-extension views or positional (upright) MRI. Supine MRI can miss instability that only shows under the weight of the head, which is why patient communities push for upright MRI and why insurers commonly deny it. The Lohkamp 2022 systematic review found low-to-moderate quality evidence, variable parameters, and only 78 reported surgical patients across the included literature. Occipito-cervical fusion (Henderson 2019, PMID 30627832) exists but is reserved for the subset with clear radiographic instability, concordant neurologic signs, and failed conservative care. Positional neck symptoms deserve specialist evaluation, not self-diagnosis or chiropractic escalation.

Lohkamp et al., Global Spine J 2022 (PMID 35195459); Henderson Sr et al., Neurosurgery Rev 2019 (PMID 30627832)

The 2017 criteria are too strict

Critics say the current hEDS diagnostic criteria (Malfait 2017) are too strict. Some clinically symptomatic patients fail Criterion 2, and clinician-assessed Beighton scores can differ from specialist assessment. The Ehlers-Danlos Society's Road to 2026 project is revisiting hEDS and HSD definitions, so this area may change as new criteria are developed.

Ritelli et al. 2024 (PMID 37774134); McGillis et al. 2019 (PMID 31840928); Aubry-Rozier et al. 2021 (PMID 34398260); Ehlers-Danlos Society Road to 2026

Interactive Tool

Group What You Have Noticed

Answer a few questions about conditions that can occur alongside EDS. You can have several at once, so the tool groups your answers by topic and doesn't rank them. You and your clinician still choose the next step from what your answers show.

Why causes can overlap

EDS-related brain fog usually has several overlapping causes, or layers. The practical question is which layer is active enough to test or treat.

In a 2025 autonomic-clinic hEDS cohort, reduced upright cerebral blood flow was common.

33% of that hEDS cohort met POTS criteria. Orthostatic vitals, a 10-minute standing test, or tilt-table referral can help decide whether the POTS or orthostatic-intolerance layer is present.

Chronic pain, instability episodes, and poor proprioception can add cognitive load. Not every pain flare is EDS-driven, but noticing when pain flares can help show which layer is active.

Novak's clinic found small-fiber neuropathy was common when it combined structure and function tests. If you have burning, tingling, numbness, sweating changes or unexplained pain, ask about neuropathy.

Mast-cell-type flares can be considered when brain fog is on-and-off, multi-system and trigger-linked. Current evidence does not support treating MCAS as automatic in hEDS.

Sources: Novak 2025 ; Igharo 2023 ; Farley 2025

Answer yes or no for each question.

Posture and autonomic
Neck and head position
Flares and reactions
Pain
Sleep
Medicines

Screening

EDS, POTS and mast-cell symptom check

These conditions can overlap, but having one doesn't mean having the others. Use this as a sorting guide. Upright symptoms suggest standing tests. On-and-off flushing or multi-system reactions suggest a mast-cell check. Pain, sleep, gut or neck symptoms may need their own checks.

Section 1 of 3EDS (Hypermobility)

Differential

EDS, POTS or a neck problem?

EDS

Body-wide: joint pain, instability, skin or tissue signs, gut symptoms, poor sleep and upright symptoms may accompany brain fog. May worsen with pain, poor sleep, prolonged upright time, GI flares, or activity strain. Beighton Score + 2017 hEDS criteria.

Malfait F et al., Am J Med Genet C, 2017

POTS

Mainly positional: brain fog is worse upright and often improves lying down. Heart rate, blood pressure, symptoms and blood flow all matter. Minutes after standing; worse in heat, after meals, or with dehydration. Orthostatic vitals, 10-minute standing test, or tilt table when symptoms fit.

Raj SR et al., Can J Cardiol, 2020

Cervical

Position-specific: brain fog may change with neck position, head turning, neck strain or neurologic symptoms, not whole-body posture alone. After neck strain, looking up, or sustained head positions; may include severe occipital headache, neurologic symptoms, or swallowing changes. Clinician-directed cervical evaluation when symptoms and signs justify it.

Russek LN et al., Front Med, 2023

Sources: Russek 2022 ; Novak 2025 ; Raj 2020

Diagnostic Criteria

How hEDS Is Diagnosed

The 2017 International Classification (Malfait et al.) diagnoses adult hEDS from an exam and your history. All three criteria need to fit. Your doctor must consider other connective-tissue, neurologic, rheumatologic and skeletal causes first.

Generalized joint hypermobility , judged by an age-based Beighton flexibility score: 6 or more before puberty, 5 or more through age 50, and 4 or more after age 50. If your score falls just short, the 5-point questionnaire can add context.

Two or more feature groups : body-wide connective-tissue features, a parent, sibling or child who independently fits hEDS, or musculoskeletal problems like chronic pain, repeated dislocations, or joint instability without injury.

Feature 3 exclusion : unusual skin, eye, gum, blood-vessel or organ fragility should lead to checks for other EDS subtypes or connective-tissue disorders. Genetic tests can confirm many other EDS types, but no gene test confirms hEDS.

Source: Malfait et al., Am J Med Genet C 2017

hEDS vs HSD

Hypermobility spectrum disorder is not a dismissal. If a person has symptomatic hypermobility but does not meet the full 2017 hEDS criteria, the same active-layer workup can still matter.

Source: GeneReviews, Hypermobile Ehlers-Danlos Syndrome

Diagnostic Criteria

Urgent vascular red flags

Vascular EDS isn't hEDS and needs urgent assessment when these signs fit. Ask about emergency or genetics-led evaluation for sudden severe headache, new localized weakness or numbness, vision or speech changes, severe unexplained chest, abdominal, back, or neck pain, bowel rupture symptoms, a collapsed lung, thin see-through skin, unexplained easy bruising, arterial aneurysm, tear or rupture, organ rupture, or a family history of vEDS or a COL3A1 variant.

Source: GeneReviews, Vascular Ehlers-Danlos Syndrome

Workup Details

Details that change the EDS assessment

People have called you 'just flexible' your whole life. But you also have brain fog, racing heart when upright, pain flares, GI symptoms, or random allergic-like reactions. Ehlers-Danlos Syndrome can be the frame, but the practical question is which layer is active right now.

BEIGHTON SCORE CHECK: The 9-point screen looks at pinky, thumb, elbow, knee, and forward-bend hypermobility

BEIGHTON SCORE CHECK: The 9-point screen looks at pinky, thumb, elbow, knee, and forward-bend hypermobility. The 2017 hEDS criteria set the cutoff by age: 6 or more before puberty, 5 or more through age 50, and 4 or more after age 50.

Malfait et al., Am J Med Genet C 2017

[DOI]

EDS and HSD can go unrecognized, and many patients hear they're 'just anxious,' 'too young for these problems,' or 'just flexible

EDS and HSD can go unrecognized, and many patients hear they're 'just anxious,' 'too young for these problems,' or 'just flexible.' If you have hypermobility, brain fog and symptoms in several body systems, it's reasonable to ask for an EDS or HSD assessment.

Demmler JC et al., BMJ Open, 2019 - national cohort study of EDS prevalence and diagnostic patterns in Wales (n=6021)

[DOI]

SKIN AND TISSUE CHECK: Soft or unusually stretchy skin, abnormal scarring, hernias, prolapse, easy bruising, or repeated joint injuries can add context to a hypermobility evaluation

SKIN AND TISSUE CHECK: Soft or unusually stretchy skin, abnormal scarring, hernias, prolapse, easy bruising, or repeated joint injuries can add context to a hypermobility evaluation. These signs should be judged against the 2017 criteria, not used alone to diagnose.

Malfait F et al., Am J Med Genet C, 2017 - 2017 EDS international classification criteria

[DOI]

In a 2025 autonomic-clinic hEDS study, 79% had slower brain blood flow when upright and 33% met POTS criteria

In a 2025 autonomic-clinic hEDS study, 79% had slower brain blood flow when upright and 33% met POTS criteria. If your brain fog reliably worsens with standing, heat or effort and improves lying down, ask about standing tests next.

Novak P, Systrom DM, et al., Am J Med Open, 2025 - cerebrovascular study of 270 hEDS patients

[DOI]

THE RANDOM REACTIONS CHECK: Do you have flushing, sudden GI symptoms, reactions to foods or medications, itching, hives, throat symptoms, or brain fog after specific triggers? These symptoms don't prove MCAS, but ask an allergist or immunologist about them, especially if they occur with hEDS and upright symptoms

THE RANDOM REACTIONS CHECK: Do you have flushing, sudden GI symptoms, reactions to foods or medications, itching, hives, throat symptoms, or brain fog after specific triggers? These symptoms don't prove MCAS, but ask an allergist or immunologist about them, especially if they occur with hEDS and upright symptoms.

Farley M et al., Ann Allergy Asthma Immunol, 2025 - systematic review of MCAS prevalence in POTS/EDS

Skip fast neck adjustments if hypermobility or neck instability is possible

Skip fast neck adjustments if hypermobility or neck instability is possible. For neck pain with neurologic symptoms, fainting, severe headache, swallowing changes or limb weakness, see an EDS-literate clinician, neurologist or neurosurgeon instead of aggressive adjustment.

Russek LN et al., Front Med, 2023 - expert consensus on upper cervical instability in hypermobility

[DOI]

FAMILY HISTORY CHECK: Ask whether close relatives have hypermobility, chronic joint pain, recurrent dislocations, aneurysm history, organ rupture, or unexplained vascular events

FAMILY HISTORY CHECK: Ask whether close relatives have hypermobility, chronic joint pain, recurrent dislocations, aneurysm history, organ rupture, or unexplained vascular events. hEDS often runs in families, but the gene is still unknown. So family history supports the case for hEDS without proving it.

Malfait F et al., Am J Med Genet C, 2017 - EDS international classification (inheritance patterns)

[DOI]

There are treatable layers

There are treatable layers. POTS or orthostatic intolerance may need a clinician-guided fluid, sodium, compression, and medication plan. Joint instability usually needs stability-focused PT. Mast-cell-type flares need proper assessment before any treatment label.

Levy HP, GeneReviews, 2004 (updated 2024) - Hypermobile Ehlers-Danlos Syndrome management

History

A Brief History of EDS Recognition

1901

Ehlers describes the first case

Danish dermatologist Edvard Ehlers describes the first case of the condition later named after him, noting very stretchy skin and loose joints.

1908

Danlos adds further case descriptions

French physician Henri-Alexandre Danlos adds further case descriptions, establishing EDS as a recognized connective tissue disorder.

1997

The Villefranche classification sets out 6 major EDS subtypes

The Villefranche classification sets out 6 major EDS subtypes, replacing earlier systems with one shared way to diagnose.

2017

The International EDS Classification expands to 13 subtypes

The International EDS Classification expands to 13 subtypes and introduces the first formal diagnostic criteria for hEDS, the most common subtype. This is the current standard.

2025

Novak and Systrom publish a large autonomic-clinic hEDS study (n=270)

Novak and Systrom publish a large autonomic-clinic hEDS study (n=270). It reports slower upright brain blood flow in 79%, POTS in 33%, and small-fiber neuropathy by combined structural and functional criteria in 82%. The clinic setting matters when applying these rates.

2026

hEDS and HSD criteria enter a formal review period

The Road to 2026 process is preparing updated EDS and HSD classification, diagnostic pathways, and management guidance. The 2017 criteria remain the standard until new publications replace them. No gene test confirms hEDS, and HSD is a real diagnosis of hypermobility with symptoms.

1901

Ehlers E, Cutis Laxa, 1901

1908

Danlos HA, 1908

1997

Beighton P et al., Am J Med Genet, 1998

2017

Malfait F et al., Am J Med Genet C, 2017

2025

Novak P et al., Am J Med Open, 2025

2026

Ehlers-Danlos Society Road to 2026; Ritelli et al., Am J Med Genet A 2024 (PMID 37774134)

This Week

Things to try

Check whether your brain fog improves when you lie down, stand less, stay hydrated, or use clinician-approved compression. The answer helps spot POTS alongside EDS.

Try your most promising change before adding more.

Body

Try one low-risk body-support step this week and check the result: seated breaks, pacing upright time, or clinician-approved compression or neck support.

Symptom tracking

Notice whether brain fog rises and falls with pain and dizziness. In EDS, all three often move together.

Movement and Energy Protocol

Stability before strength, pacing before pushing

In hEDS, loose joints are only part of the movement problem. Your sense of where a joint sits (proprioception) often works poorly, which is why stretching to the limit and generic strengthening can make pain and instability worse. Hypermobility-informed physiotherapy often starts with proprioception and posture. Pacing matters too, because brain fog rises and falls with pain, sleep, time upright and lost fitness.

1

Proprioception and posture first. Many specialist physios begin with body-awareness work (joint position sense, balance, postural control), then motor control training, then strengthening. No study has shown one order works better than another. Skipping this step is one reason generic gym programs and aggressive stretching can make hypermobile patients worse.

Engelbert et al., Am J Med Genet C 2017 (PMID 28306230); Palmer et al. systematic review 2021 (PMID 34145717).

2

Closed-chain and isometric work beats end-range stretching. Closed kinetic chain exercises (foot on ground, hand on wall, co-contraction around a joint) build stability without driving the joint into the unstable end of its range. One small home-based closed-chain program improved proprioception and quality of life in the Palmer 2021 review.

Palmer et al., PMID 32681365; Ferrell et al., Arthritis Rheum 2004, PMID 15476239.

3

Reclined exercise when standing worsens brain fog. A reclined bike, rowing and floor-based strength work are easier to tolerate than upright cardio. This is standard in autonomic-informed POTS rehab, and hypermobility-informed PTs may start here when you also have POTS.

Fu Q, Levine BD, Auton Neurosci 2018 (DOI 10.1016/j.autneu.2018.07.001).

4

Pacing and the energy envelope. The practical version: find the activity level that does not produce next-day flare, and keep most days at or below it. Slowly raise your activity level only once your baseline is steady. Notice how standing time, meals, poor sleep and pain flares affect your brain fog, and which one used up today's energy.

Clinical observation; see Palmer 2021 review for pacing as part of hEDS management.

5

Find a hypermobility-informed PT if you can. Hypermobility-informed physiotherapy is a different discipline than general orthopedic rehab. Aggressive manual therapy to the neck in particular is discouraged in patients where hypermobility with cervical instability is plausible (Russek et al., Front Med 2023). A clinician who knows the Beighton, the trifecta (hEDS + POTS + MCAS), and closed-chain principles matters more than the specific clinic label. Patient communities often report that generic strengthening programs and bouncing end-range stretches made things worse, though no single paper proves it.

Russek et al., Front Med 2023 (DOI 10.3389/fmed.2022.1072764).

Use this protocol alongside your clinician's care. If you have measurable instability, worsening neurologic symptoms, or suspected neck instability, ask a specialist for movement advice and skip generic programs.

Doctor Prep

Talking to Your Doctor

Opening Script

I'd like to discuss whether my hypermobility-related pain, dysautonomia, or poor sleep drives my brain fog. What would make EDS a more or less likely explanation?

Tests to Request

  • Beighton Score
  • Orthostatic Vital Signs and Active Stand Test
  • CBC + CMP Blood Test Bundle
  • TSH, B12 and Ferritin Tests
  • Medication Review
  • Overnight Sleep Study (PSG)
  • Genetic assessment when signs suggest another EDS type

Key points to make

  • Ask whether the appointment is confirming hEDS or HSD, checking for another EDS type, or investigating a separate cause of brain fog.
  • No gene test currently confirms hypermobile Ehlers-Danlos syndrome (hEDS). Doctors order genetic testing when your history and exam suggest another inherited connective-tissue disorder.
  • A Beighton score measures selected joint movements. The full hEDS assessment also needs tissue and musculoskeletal findings, family history, and exclusion of another diagnosis.
  • POTS and mast-cell testing should be based on the symptoms. Current expert guidance does not support testing every person with hEDS or HSD for both.
  • Pain, sleep, migraine, medicines, upright symptoms, anemia, thyroid, B12, and mood are separate questions that can each change care.

What you've noticed

  • Brain fog gets worse after standing, a fast heart rate, dizziness, near-fainting, heat, a shower, a meal, or long periods upright, and improves after lying down.
  • Poor sleep, high pain, migraine, a joint injury, or a medicine dose clearly comes before the thinking problem.
  • You have a history of unusually flexible joints across the body, joints that partly or fully dislocate, long-lasting muscle or joint pain, unusual skin or tissue findings, or relatives with a diagnosed EDS type.
  • Burning pain, altered sweating, numbness, bowel or bladder symptoms, or other signs may need a separate nerve or autonomic assessment.
  • Some signs raise a different, more urgent genetics question: thin see-through skin, very fragile tissue, unexplained artery injury, bowel or uterine rupture, collapsed lung, or a relative with vascular EDS.

Questions for your clinician

  • Do I meet the current criteria for hEDS, HSD, another EDS type, or none of these?
  • What does my Beighton score show, and which history, skin, tissue, pain, and family findings still need examination?
  • Do any findings suggest classical, vascular, or another EDS type that needs genetic testing?
  • Could pain, migraine, sleep, medicines, anemia, iron, B12, thyroid, or another condition explain my brain fog better?
  • Do my upright symptoms justify lying-to-standing heart rate and blood pressure, a NASA Lean Test, tilt-table testing, or cardiology or neurology review?
  • Do flushing, hives, swelling, wheezing, vomiting, diarrhea, or symptoms in more than one body system call for an allergy or mast-cell assessment, or is testing unnecessary?
  • Do burning pain, numbness, altered sweating, or weakness justify a nerve examination or small-fiber-neuropathy testing?
  • What can I safely do now for sleep, joint protection, strength, pain, work or school adjustments, hydration, and upright symptoms?

What to bring

  • Bring any hEDS, HSD, EDS, genetics, rheumatology, rehabilitation, physiotherapy, cardiology, neurology, sleep, or pain letters.
  • List joints that were unusually flexible in childhood, joints that partly or fully dislocate, repeated sprains, long-lasting pain, scars, bruising, hernias, prolapse, dental crowding, and wound-healing problems.
  • Bring a family history of diagnosed EDS, aneurysm, dissection, organ rupture, collapsed lung, sudden unexplained death, very fragile skin, repeated dislocations, or similar symptoms.
  • List what happens after standing, walking, heat, showers, meals, pain, poor sleep, migraine, neck movement, exercise, or a medicine dose. Include heart rate and blood pressure only if already measured safely.
  • Bring ECG, echocardiogram, vascular imaging, spine imaging, sleep study, CBC, ferritin, B12, thyroid, vitamin D, celiac, and autonomic results already completed.
  • Bring every medicine, supplement, pain treatment, brace, compression item, mobility aid, and exercise or physiotherapy plan.
  • Prepare two real examples of what brain fog stopped you doing, such as driving, working, studying, following instructions, cooking, or managing medicine.

Sources: NCBI ; Ehlers-Danlos Society ; Ehlers-Danlos Society ; Aziz 2025 ; Sousa 2025 ; Tariq 2025 ; Novak 2025 ; NHS ; Sydney Local Health District

Doctor Prep

Red flags to mention

Sudden severe chest, back, abdominal, head, or neck pain with fainting, weakness, speech trouble, breathing difficulty, or a new neurological symptom needs emergency assessment.

New or worsening arm or leg weakness, loss of feeling, trouble walking, loss of bladder or bowel control, or numbness around the groin needs urgent spinal or neurological assessment.

Get urgent care for a dislocated joint with a cold or pale limb, no pulse, severe numbness, or a limb you can't move. Let a clinician put the joint back in.

Fainting with chest pain, a sustained irregular heartbeat, severe breathlessness, injury, or confusion needs urgent assessment.

Thin translucent skin, easy bruising, a collapsed lung, or a family history of vascular EDS needs specialist review. So does an arterial aneurysm or dissection, bowel or uterine rupture, or a known COL3A1 variant.

Pregnancy with known or suspected vascular EDS, severe new pain, bleeding, fainting, or breathing trouble needs urgent obstetric assessment.

Doctor Prep

Sodium-Loading Safety Handout (for your clinician)

If your doctor considers sodium loading for POTS or orthostatic intolerance, bring these items to the conversation. The goal is a supervised plan, not a self-set target.

Baseline blood pressure. Several resting readings from the days before loading so you can both see if it changes.

Conditions that change the decision: kidney disease, heart failure, uncontrolled hypertension, liver disease or cirrhosis, pregnancy (preeclampsia risk), hyperaldosteronism or Cushing's, diabetes with blood-pressure issues.

Medications that also retain sodium or raise blood pressure: ACE inhibitors, ARBs, lithium, diuretics, NSAIDs (ibuprofen, naproxen), corticosteroids (prednisone), cyclosporine, tacrolimus. Bring the full medication list.

Stop-and-seek signs to agree on: weight gain over 2-3 lb/day or 5 lb/week, new shortness of breath lying down or 1-2 hours after falling asleep, chest pain, rapid leg or abdomen swelling, pink-tinged sputum, blood-pressure spikes, fainting.

For children and teens: the 10-12 g/day salt target is an adult consensus number; there's no set pediatric POTS dose yet (2024 pediatric POTS clinical review). A pediatric autonomic specialist should lead the plan.

Orthostatic confirmation first: tilt-table, 10-minute stand test, or supervised NASA lean test should show POTS or orthostatic intolerance before sodium loading. Brain fog alone is not enough reason.

Sources: Sheldon, Heart Rhythm 2015 (PMID 25980576); Vernino, Auton Neurosci 2021 (PMID 34144933); Lee, J Med Virol 2024 (PMID 38456315); Garland, JACC 2021 (PMID 33926653); Harirforoosh et al., NSAIDs and the Kidney, J Pharm Pharm Sci 2013 (PMC4036662); StatPearls, Corticosteroid Adverse Effects (NBK531462); pediatric POTS clinical review 2024 (PMC11472415); AHA heart-failure self-monitoring guidance.

Common Questions

FAQ

Is it this cause

How is EDS brain fog different from POTS brain fog?

EDS brain fog and POTS-pattern brain fog can overlap because about 33% of hEDS patients in a 2025 autonomic-clinic cohort also met POTS criteria. EDS fog may travel with joint pain, instability, sleep disruption, GI symptoms, and multisystem strain beyond orthostatic intolerance alone. The POTS kind is more positional, worse upright and better lying down. Heart rate and blood-flow changes are key signs. In practice, many people have both. If the POTS layer is present, treatment is clinician-guided and may include fluids, sodium, compression, recumbent conditioning, pacing, and medication. The same 2025 study found reduced upright cerebral blood flow was common even when full POTS criteria were not met.

Novak P et al., Am J Med Open, 2025

Sources: Novak 2025 ; Raj 2020 ; Sheldon 2015

I think I have EDS but my joints do not dislocate - can I still have it?

Yes. Dislocations are only one possible musculoskeletal feature in the 2017 criteria. Some people meet the criteria through widespread hypermobility, long-term pain, joints that keep slipping, signs in other body systems, or family history. Others fit hypermobility spectrum disorder instead of hEDS. A clinician still needs to exclude other connective-tissue, neurologic, rheumatologic, and skeletal causes.

Malfait F et al., Am J Med Genet C, 2017; Tofts LJ et al., Orphanet J Rare Dis, 2023

Sources: Malfait 2017 ; Tofts 2023

Can EDS cause brain fog?

Ehlers-Danlos syndrome can involve several separate causes of brain fog. If it's worse when you're upright and you've been hypermobile for years, tell a clinician both so they look beyond EDS alone.

What does EDS brain fog usually feel like?

It often feels like your body and your brain are both unreliable in the same way. Pain, poor sleep, upright intolerance and general physical instability stack up until thinking starts to fail too. Standing, heat, pain flares, GI strain, food or medication reactions, or neck-position symptoms may make the brain fog worse. Some people find lying down helps, which points testing toward orthostatic intolerance or POTS, not EDS alone.

How quickly can I tell whether this path is helping?

That depends on which layer is active. If POTS or orthostatic intolerance is confirmed, clinicians should guide fluid, sodium, compression, conditioning and medication plans. Hypermobility-informed PT usually needs weeks to show results and should focus on stability, proprioception, pacing, and joint protection rather than end-range stretching.

Sources: Fu 2018 ; Sheldon 2015

Can EDS brain fog affect work and daily functioning?

Yes. EDS-related fog may affect work, school, and daily life, especially when upright symptoms, pain, or poor sleep stack. Accommodations may include flexible seating, rest breaks, reduced standing, ergonomic equipment, or remote options depending on the job and the symptoms. Documenting fog alongside pain, sleep, upright time, and flares can strengthen the clinical and workplace conversation.

Sources: Sousa 2025 ; Müller 2026

Testing

What tests should I discuss for EDS brain fog?

Ask for symptom-gated testing rather than a fixed trio. Use the Beighton Score and 2017 hEDS criteria for the hypermobility frame. If brain fog worsens upright, discuss orthostatic vitals, a 10-minute standing test, or tilt-table referral. If flushing, hives, GI flares, throat symptoms, or food and medication reactions cluster with fog, discuss baseline plus flare-timed tryptase and urine mediator testing with allergy or immunology. If burning, tingling, sweating changes, or unexplained pain fit, ask whether small-fiber neuropathy testing is appropriate. If neck-position symptoms, neurologic signs, or instability history fit, ask for clinician-directed cervical evaluation.

Is there a genetic test for hEDS?

Not yet. Many other EDS types have one, but hEDS doesn't. Doctors diagnose it with the 2017 clinical criteria: generalized joint hypermobility, two or more Criterion 2 feature groups, and the Criterion 3 exclusions (other conditions ruled out). Genetic testing can help check other EDS types when features or family history suggest them, especially vascular EDS, because doctors manage it differently.

Source: Malfait 2017

Treatment

If EDS is behind my brain fog, does anything actually help?

The useful first step is pattern sorting: age-aware Beighton screening for the hypermobility frame, and orthostatic vitals or standing testing when fog is worse upright. If POTS or orthostatic intolerance is found, a clinician-guided plan may include fluids, sodium, compression, medications, and pacing. Hypermobility-informed physical therapy focuses on stability over stretching and usually needs weeks to show a clear pattern. If mast-cell-type flares are part of the story, get evaluated before assuming MCAS treatment is the answer.

Raj SR et al., Can J Cardiol, 2020; Aziz Q et al., Clin Gastroenterol Hepatol, 2025

Sources: Raj 2020 ; Aziz 2025

What do people usually try first when they suspect EDS?

Start with the Beighton score and the full 2017 hEDS criteria. The cutoff depends on age: 6 or more before puberty, 5 or more through age 50, and 4 or more after 50. The criteria also include Criterion 2 features and Criterion 3 exclusions. If brain fog is worse upright and better lying down, ask about orthostatic vitals or standing testing.

Source: Malfait 2017

When to see a clinician

I think EDS is causing my brain fog. Which specialist should I see first?

Start with a clinician who can record your symptoms and refer you: usually primary care, genetics, rheumatology, or a hypermobility-aware clinician, depending on your health system. The Beighton Score is a screen with age-based cutoffs. Formal hEDS diagnosis uses the full 2017 criteria and excludes other causes. If brain fog is worse upright and better lying down, also ask about orthostatic vitals or active stand testing.

Malfait F et al., Am J Med Genet C, 2017

Sources: Malfait 2017 ; Novak 2025 ; Sheldon 2015

When should I bring EDS brain fog to a clinician?

See a clinician when brain fog is persistent, disabling, progressive or tied to red flags. If it's reliably worse upright and better lying down, ask about orthostatic vitals or POTS testing. If flushing, itching, hives, throat symptoms or GI flares come with triggers, ask about mast-cell mediator testing. If neck-position symptoms come with severe headache at the skull base, neurological symptoms, swallowing changes or limb weakness, ask for a neck evaluation. Sudden or worsening neurological symptoms need urgent care, not reassurance.

Source: Tinkle 2017

Community

What people with EDS have learned

What Helped

  • Getting the diagnosis or framework after years of scattered symptoms. Just having a name changed everything.
  • Fluid, sodium, and compression planning when orthostatic testing showed POTS or hypoperfusion
  • PT who understands EDS: regular PT made things worse. EDS-informed, stability-focused PT was the turning point
  • Compression garments showed some people how standing affects their thinking

What Didn't Help

  • Stretching (standard PT advice): the joints were already too flexible and needed the opposite.
  • Chiropractic adjustments: manipulating hypermobile joints made instability worse.
  • Being dismissed because 'you're too young for these problems'
  • Treating the symptoms as anxiety alone when dysautonomia was also present

Surprises

  • EDS, POTS, mast-cell-type flares, pain, poor sleep and GI symptoms can overlap and add up
  • Small fiber neuropathy was common in Novak's hEDS clinic cohort and can be worth discussing when burning, tingling, numbness, or sweating changes fit
  • Cervical instability (an unstable neck) can be a cause when brain fog changes with your position and you also have neck or neurological symptoms

Common Mistakes

  • Accepting 'you're just flexible' as a diagnosis
  • Not checking for POTS when symptoms worsen upright
  • High-impact exercise that destabilizes joints
  • Ignoring mast-cell-type flares when symptoms are episodic, multi-system, and trigger-linked

Community Tip

EDS isn't just being bendy. It can travel with orthostatic intolerance, pain, sleep disruption, GI symptoms, and mast-cell-type flares. If you are hypermobile, foggy, and your heart races when you stand, ask for orthostatic testing instead of assuming anxiety is the whole story.

Reversibility

Is EDS Fog Reversible?

EDS doesn't clear up the way an infection or a vitamin deficiency can. A better question is whether something treatable is driving your brain fog today. The connective-tissue diagnosis stays, but your thinking may improve once you treat that cause.

These can each improve function, on different timelines: treating orthostatic intolerance, stability-focused physical therapy, better sleep, GI/nutrition support, and mast-cell treatment when the evidence supports MCAS.

Recovery Factors

Finding and treating POTS when standing or heat worsens brain fog

Mast-cell or histamine workup when flares are multi-system and trigger-linked

Clinician-directed cervical evaluation when neck position, neurologic signs, or instability history fit

Pain control (chronic pain consumes cognitive resources)

Sleep quality (often disrupted by pain and autonomic issues)

Novak P et al., Am J Med Open, 2025 (DOI: 10.1016/j.ajmo.2025.100111); Raj SR et al., Can J Cardiol, 2020 (DOI: 10.1016/j.cjca.2019.12.024)

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Last reviewed 2026-03-23 | Reviewed by Dr. Alexandru-Theodor Amarfei, M.D.

Related Causes

POTS

Histamine

Cervical

Hypoperfusion

Pain

Sleep

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References
  1. Malfait et al., Am J Med Genet C, 2017 - EDS international classification
  2. Tinkle BT, Castori M, et al., Am J Med Genet C, 2017 - Clinical description and natural history of hEDS
  3. Novak P, Systrom DM, et al., Am J Med Open, 2025 - Cerebrovascular, autonomic and neuropathic features of hEDS
  4. Raj SR, et al., Can J Cardiol, 2020 - Canadian Cardiovascular Society position statement on POTS
  5. Aziz Q, et al., Clin Gastroenterol Hepatol, 2025 - AGA clinical practice update on GI in hEDS
Guide index

Useful next steps

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Related context

Connected Causes

EDS-related fog can overlap with POTS or orthostatic intolerance, mast-cell-type flares, migraine, cervical symptoms, GI dysmotility, and chronic pain because the useful question is often which active...

Active Layers

Path B (Managing) sorts EDS fog into POTS, mast-cell, fibro, CCI, sleep, and small-fiber neuropathy layers.

Clinical Summary

EDS-related brain fog usually appears as part of a connective-tissue cluster with autonomic, pain, GI, and positional symptoms, not an isolated brain problem.

Moderate-High - 2017 classification; diagnosis is clinical for hEDS and often specialist-supported

2017 EDS International Classification; NICE referral criteria

Last reviewed: 2026-03-23

Reviewed by: Dr. Alexandru-Theodor Amarfei, M.D.

Country Pathways

US: See geneticist / EDS-literate rheumatologist

UK: See geneticist / rheumatologist

AU: See clinical geneticist or rheumatologist with EDS experience