When can the CSI help?
CSI may help when thinking gets harder on the same days as pain, poor sleep, headaches, or dizziness. The same goes for gut or pelvic symptoms, bright light, noise, and crashes after activity. Use the score to choose what needs review, such as pain, sleep, pacing, medicines, mood, or warning signs.
The symptoms
Pain and thinking problems happen on the same days
Check whether thinking is worse with pain, poor sleep, bright light, noise, migraine, pelvic or gut symptoms, or a crash after activity.
The number
A score of 40 is a common flag
A score of 40 or higher may call for a closer pain review. It doesn't show the cause.
The plan
Use the score to choose the next review
The next review may focus on pain, sleep, pacing, medicines, mood, pelvic health, inflammation, or the brain and nerves.
CSI is a symptom form, not a scan or nerve test. Read it with your health history, daily problems, and an exam when needed.
Save this test
Save the details, not only the number
Save the score, what symptoms were active, and the question you want answered at the visit.
Use the saved score to compare weeks, not to diagnose yourself.
How do age, pain condition, and symptoms affect the score?
Age, sex, language, culture, pain, sleep, mood, trauma, pregnancy, and crashes after activity can affect the score.
Adults with chronic pain
The best-supported use is as a symptom-burden tool in chronic pain settings. It helps show whether symptoms cluster beyond one local injury, but it doesn't replace a pain exam.
Women, pelvic pain, and endometriosis
Central-sensitivity screening is common in discussions about pelvic pain and endometriosis. A high CSI score isn't a reason to dismiss pelvic disease, heavy bleeding, bladder or bowel symptoms, or pain that needs a gynecology review.
Men and under-recognized pain
Men may be less likely to describe sensory overload, mood effects, or pelvic and widespread pain in the language a questionnaire expects. A low score shouldn't stop a careful pain, sleep, medicine, and neurological review when symptoms remain concerning.
Teens and young adults
An adult CSI score isn't a shortcut to diagnosing a teen. Younger people need age-appropriate assessment, school and activity context, family support, sleep review, and red-flag screening.
Pregnancy and postpartum
Pain, sleep loss, pelvic symptoms, mood symptoms, migraine, anemia, thyroid change, and medication changes can all affect the score. The result should help plan care, not blame the person for being sensitized.
Older adults
Arthritis, nerve damage, falls, sleep disruption, loneliness, medicines, memory or thinking changes, and lower activity can affect scores. New local pain, weakness, falls, or brain and nerve signs need a direct check, whatever the CSI shows.
How to take the CSI without throwing the result off
Use the same version each time if you repeat it. The usual CSI Part A has 25 items scored 0 to 4, for a total from 0 to 100.
Answer for how things really are lately, not your best or worst day. If the instructions specify a time frame, follow that version's instructions.
Save the reason you're taking it. The reason may be widespread pain, a fibromyalgia discussion, long COVID, or pain after an injury. Other reasons include pelvic pain, sensory overload, sleep problems, or brain fog that worsens with pain and stimulation.
Bring details that can change the score. Include poor sleep, migraine, endometriosis, inflammatory disease, neuropathy, depression, anxiety, or PTSD. Add medicine effects, alcohol or cannabis, infection recovery, and your current workload.
Keep the questionnaire's protected wording out of My Fog and public notes. Save the total score, date, version, setting, and your own examples.
Keep Parts A and B separate
Part A is the symptom score. Many versions also ask about diagnosed conditions in Part B. Keep those separate so nobody mistakes a condition checklist for the 0 to 100 score.
Treat 40 as a flag
A score of 40 or higher is a common flag from the original chronic-pain validation work. It's a reason to ask better follow-up questions, not proof of a single mechanism.
Pair it with the pattern
Save the score with pain location, sensory overload, sleep, fatigue, activity crashes, migraine, pelvic pain, gut flares, mood, medicines, and what helps or worsens thinking problems.
How do you read a CSI score?
Save the score with what happened that week and which daily task became harder.
0 to 39
The score is below the common 40-point flag. Pain or thinking problems may still need a review of sleep, mood, medicines, inflammation, migraine, nerves, anemia, thyroid health, or another cause.
Around 40, or a score that changed clearly from your last one
Look at what changed that week. Poor sleep, a pain flare, recovery from an infection, pelvic symptoms, light or noise, work stress, or medicines may move the score.
40 or higher, especially when repeated or paired with widespread pain and sensory sensitivity
The score supports a closer pain review. The plan may include an exam, a warning-sign check, sleep care, a medicine review, pacing, physical therapy, or mental health support.
A high score can have more than one cause
Poor sleep, distress, fear of movement, pain, and other symptoms can all raise the score. A clinician can help decide which apply.
See research details
These notes keep the CSI useful without overstating it.
Use the score as symptom context. Do not call it a direct nervous-system measurement.
Keep the 40-point number because it is cited and useful, but label it as a sample-derived cutoff, not a universal cutoff for every person.
If the score is high, ask what part is pain sensitivity, what part is sleep or distress, and what part needs another exam or test.
This supports using CSI as one part of pain reviews. The questionnaire still can't replace clinical assessment or sensory testing.
Save the score when it would change the assessment or the plan. Read it beside symptoms, function, exam findings, and the reason you took it.
If work function is the problem, also save the job task, pain intensity, hours, pacing limits, sleep, and support needs. CSI alone may not explain the work loss.
You can't generalize that study to every person with long COVID. If dysautonomia, hypoperfusion, small-fiber symptoms, or post-exertional crashes are present, those still need their own workup.
What can you do with the score?
Think about what made symptoms better or worse that week. Do not force activity that causes a crash.
Record pain and brain fog together
For one week, note pain areas, sleep, sensory overload, activity, stress, migraine, gut or pelvic symptoms, medicine timing, and brain fog. Mark whether brain fog gets worse after increased pain, poor sleep, sensory stimulation, or exertion.
Pace before you push
If symptoms flare after activity, start by finding the amount you can repeat without a crash. Exercise can help some chronic pain states, but post-exertional malaise, acute injury, neurologic symptoms, and pregnancy or postpartum complications need a different plan.
Use pain education carefully
Pain neuroscience education can help some people understand why pain can be real even when tissue damage doesn't explain all of it. No one should use it to tell someone the pain is imagined.
Ask which screening test you may need next
The next check depends on your symptoms. It may be a pain map, sleep study, actigraphy, PHQ-9, GAD-7, or a baseline cognitive assessment. Other options include a medicine review, inflammation tests, thyroid tests, ferritin, B12, or an exam of the brain and nerves.
Do not use CSI to ignore warning signs, diagnose yourself, change medicine, or force exercise through a crash. Do not dismiss pain as psychological or delay urgent care. Get direct help for new problems with the brain or nerves, chest pain, fever, or severe weakness. Cancer history, unexplained weight loss, bowel or bladder changes, and suicidal thoughts also need direct help.
What should you save in My Fog?
Keep these together
- CSI total score, date, version, and whether you answered Part B
- Why you took it and what symptoms were active that week
- Pain map, sensory triggers, sleep, activity crashes, migraine, gut or pelvic symptoms
- Mood screeners, medicines, alcohol or cannabis, infection recovery, and workload
- What helped, what worsened symptoms, and what question you want the clinician to answer
Question for the visit
“Can we use this CSI score as a symptom-burden clue, not a diagnosis, and decide what needs pain, sleep, medication, mood, pacing, pelvic, neurologic, or inflammatory follow-up?”
Sources for Central Sensitization Inventory
Definition of central sensitization, sensitization, and nociplastic pain boundary
Original development and psychometric validation context
40 out of 100 cutoff, AUC, sensitivity, and specificity
Limits of self-report central-sensitization questionnaires and psychological construct overlap
Associations between CSI scores and quantitative sensory testing measures
Measurement properties of patient-reported tools in chronic pain with central sensitization
CSI limits for explaining presenteeism and quality of life in musculoskeletal pain
Emerging long-COVID association context and generalization limits
See each claim's sources
procedure
CSI Part A is used as a symptom questionnaire scored from 0 to 100, commonly described as 25 items scored 0 to 4.range
A CSI score of 40 out of 100 is a commonly used screening flag from an outpatient chronic-pain sample, where it separated the CSS patient group from a nonpatient comparison sample with AUC 0.86, sensitivity 81%, and specificity 75%.limitation
IASP defines central sensitization as increased responsiveness of central nervous system nociceptive neurons, while the CSI is a self-report questionnaire and cannot directly prove that neurophysiological state.interpretation
Systematic reviews report useful measurement properties for CSI, including reliable and valid symptom-burden data in central-sensitivity-related chronic pain contexts.limitation
Reviews disagree on how strongly CSI is linked to quantitative sensory testing. A 2023 meta-analysis found weak or no links with several experimental measures, while a 2024 review found significant associations, strongest for pressure pain threshold.limitation
In a 2026 musculoskeletal-pain study of 110 employed participants, CSI added limited explanatory value for presenteeism and health-related quality of life after a broader risk questionnaire was included.context
A 2026 referred long-COVID orthostatic-intolerance cohort used CSI and found central-sensitization classification in 81% of participants, but this should not be generalized to all long-COVID patients.context
Recent pelvic-pain and endometriosis reviews discuss CSI as a screening tool in overlapping pelvic pain syndromes, but a high score does not rule out pelvic disease or replace gynecology evaluation.safety
Pain neuroscience education and exercise may help some chronic pain groups, but treatment must be matched to the condition, red flags, and post-exertional symptom response.