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Doctor appointment handout

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How to prepare for an appointment about chemo brain

Write down what became harder, when it changed, and which cancer treatments and medicines you were receiving. Cancer-related thinking changes can begin before, during, or after treatment.

Start here Start with your cancer diagnosis, treatment names and dates, radiation to the brain or head, and surgery. Add current medicines, infections, blood counts, sleep, pain, mood, nutrition, menopause or hormone treatment, and daily safety. Bring Take the treatment summary, medicine list, laboratory results, and scan reports. Add symptom dates, school or work concerns, and two examples of memory, attention, word-finding, or planning problems. Ask Could cancer or treatment explain these changes? Which treatable causes, nerve or brain concerns, medicine effects, tests, rehabilitation, or work and school supports should be addressed now? Know “Chemo brain” is a common name, but chemotherapy is not the only possible cause. Cancer, surgery, radiation, immunotherapy, hormone treatment, medicines, anemia, infection, pain, sleep, and distress can affect thinking.

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Chemo Brain: Cognitive Changes, Recovery and Doctor Questions, a doctor appointment handout from What Is Brain Fog.
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What to explain

Name the exact thinking problem, when it began, and what it stops you doing.

I would like to discuss what may be contributing to my thinking and memory problems. Possible causes include cancer, cancer treatment, a medicine, poor sleep, pain, low blood counts, hormones, nutrition, or another health problem. Could we review what changed and decide what tests, rehabilitation, or work and school support may help?

Questions to take in

Ask what may be reversible, whether testing is needed, how to protect safety, and which rehabilitation or practical support is available.

  1. Could the cancer itself or one of my treatments be contributing? Please consider chemotherapy, surgery, radiation, immune treatment, targeted treatment, hormone treatment, transplant care, and medicines used for side effects.
  2. Which reversible causes should we check now, including anemia, infection, thyroid disease, B12, iron, sleep, pain, nutrition, menopause symptoms, depression, anxiety, or sleepiness from medicine?
  3. Does my neurological examination show a reason for brain MRI, EEG, neurology review, or urgent cancer assessment?
  4. Would a short thinking test or a full assessment help plan my care? Could it guide rehabilitation, work or school support, disability paperwork, driving advice, or follow-up?
  5. Which support fits my problem? Options may include a neuropsychologist, occupational therapist, speech and language therapist, psychologist, physical therapist, thinking rehabilitation program, or cancer survivorship service.
  6. Which medicines can we safely reduce, move to a different time, or replace without weakening cancer treatment or causing withdrawal?
  7. Which exercise, sleep, nutrition, pain, and fatigue treatments are safe for my cancer, blood counts, bones, heart, nerves, and current therapy?
  8. What improvement is realistic for my treatment history, and when should we repeat the functional or cognitive assessment?

Reviews and tests your cancer team may consider

What each medicine, cognitive, blood, sleep, or imaging assessment can tell you.

There is no single blood test or brain scan for thinking problems linked with cancer care. The clinician starts with your cancer and treatment timeline, medicines, and examples from daily life. They also check the nervous system and look for causes that can be treated.

Medication Review

A medication review checks cancer treatments, steroids, anti-nausea drugs, pain medicines, sleep medicines, antihistamines, and supplements. It may find sleepiness, interactions, or timing that worsens attention.

Read the test guide

Neuropsychological Evaluation

A neuropsychological evaluation measures attention, processing speed, memory, language, and planning. It can guide cognitive rehabilitation, work or school support, and follow-up. It does not identify one cause by itself.

Read the test guide

CBC + CMP Blood Test Bundle

A CBC can show anemia, infection-related blood-cell changes, or low platelets. A CMP checks glucose, electrolytes, kidney, liver, and proteins. Neither panel diagnoses chemo brain.

Read the test guide

TSH, B12 and Ferritin Tests

TSH checks thyroid signaling. Vitamin B12 and ferritin assess two treatable causes of fatigue or thinking problems. Results need symptoms, treatment history, supplements, blood counts, and laboratory ranges.

Read the test guide

Brain MRI

A brain MRI may be used when the nerve and brain examination or cancer history raises concern about a physical change. Seizures, severe headache, rapid decline, or a new symptom in one part of the body can also lead to imaging. It is not routine proof of chemo brain.

Read the test guide

Sleep Study (PSG)

A sleep study can assess sleep apnea or another sleep disorder. Reasons include snoring, gasping, witnessed breathing pauses, morning headaches, or marked daytime sleepiness.

Read the test guide

Before the appointment

Take the records that show treatment exposure, medical changes, thinking problems, and the effect on daily life.

Bring your cancer diagnosis, stage when known, and treatment summary. Add chemotherapy and immunotherapy names, radiation field and dose, surgery dates, transplant history, and the current treatment plan.

Every prescription, over-the-counter medicine, supplement, cannabis product, alcohol use, and recently stopped medicine. Include dose times and when you're sleepy or confused.

CBC, CMP, thyroid, vitamin B12, ferritin, glucose, hormone, infection, kidney, liver, and nutrition results. Include dates and laboratory ranges.

Brain imaging, neurological reports, neuropsychological testing, office cognitive screens, hearing and vision results, and earlier school or work assessments.

A dated list of changes: attention, memory, word-finding, reading, planning, organizing, multitasking, balance, headaches, seizures, weakness, sleep, pain, mood, and fatigue.

Two examples of tasks now slower, unsafe, or impossible: medicines, cooking, driving, work, school, childcare, money, appointments, or conversations.

A seven-day record of sleep, pain, fatigue, meals, hydration, treatment days, medicine times, fever, symptoms, and which daily tasks were affected.

A support person if you want help remembering the visit. Ask before recording the appointment and request written instructions.

Write one example with enough detail to understand the risk.

For example: I forgot the stove twice this month. A task that took 15 minutes now takes 40, and I stopped driving at night because I miss turns.

How the doctor assesses this

Details that help the cancer team assess thinking and memory changes

  • During or after cancer care, you became slower at reading, planning, or learning. You may also struggle to find words, remember appointments, follow conversations, or do more than one task.
  • The change began near cancer treatment. This may include chemotherapy, brain radiation, surgery, immune treatment, targeted treatment, hormone treatment, steroids, anti-nausea medicine, or pain medicine.
  • You may also have fatigue, poor sleep, pain, infection, low blood counts, low food intake, menopause symptoms, anxiety, depression, or sleepiness from a medicine.

Other causes of thinking problems during or after cancer care

  • Thinking problems clearly began before the cancer diagnosis and did not change with the cancer, treatment, medicines, sleep, pain, or blood results.
  • Thinking improves after a confirmed cause is treated. This may be anemia, infection, thyroid disease, a vitamin shortage, sleep apnea, pain, depression, or a sedating medicine.
  • Symptoms occur only during fever, dehydration, low blood sugar, a medicine dose, severe pain, panic, or too little sleep. Fixing that cause makes them go away.
  • A neurological assessment finds a stroke, seizure disorder, brain lesion, neurodegenerative disease, or another condition that better explains the decline.
  • The concern is based only on one low test score, with no change in daily function or treatment timing. Language, education, hearing, vision, fatigue, mood, and a repeat assessment have not yet been reviewed.

What to understand before choosing care

How to handle treatment effects, medicines, blood or hormone changes, sleep, mood, pain, neurological disease, safety, rehabilitation, work, or school.

  • Tell the oncology team early. Speak up during treatment if memory, attention, or planning problems affect medicines, falls, driving, work, school, cooking, money, or childcare.
  • Check with your team before stopping cancer treatment, steroids, hormone treatment, pain medicine, sleep medicine, or anti-nausea medicine. Ask for a structured medicine review.
  • Use one calendar, alarms, written medicine instructions, labeled storage places, and one task at a time. Ask someone you trust to help with high-risk tasks.
  • Ask which support is safe and available. Options may include light physical activity, sleep treatment, pain control, nutrition care, help retraining thinking skills, occupational therapy, or work and school changes.
  • Ignore supplement or “brain detox” claims during cancer treatment. Supplements can affect chemotherapy, radiation, surgery, hormone treatment, blood thinners, and other medicines.

What the research found

What current cancer guidance and 2025 to 2026 research say about thinking changes, assessment, and rehabilitation.

Cancer Council Australia cites one study about changes in thinking and memory. It reported changes in about one in three people before treatment, up to three in four during treatment, and one in three after treatment.

The Australian figures come from one study and do not predict one person's risk. Cancer, treatment, age, health, sleep, pain, mood, medicines, and measurement methods differ.

A 2025 systematic review linked chemotherapy-related thinking problems with reported changes in brain networks.

A 2026 cognitive-training review included 15 studies. Its 12-study meta-analysis covered 1,085 participants and found a small executive-function benefit with low-quality evidence, but no clear benefit in several other areas.

A separate 2026 review found only 17 studies of brain stimulation and related non-drug approaches, including case reports and small trials. Evidence was too mixed for one universal treatment.

A normal office test doesn't mean a daily problem isn't real, and an abnormal score doesn't prove chemotherapy caused it. Treatment history, function, reversible causes, and repeated assessment still matter.

The 2026 ASCO Educational Book review says the cancer itself, its treatments, and mental, social and lifestyle factors can all contribute to cancer-related thinking problems. It notes that people's own symptom reports often don't match formal thinking test scores. A 2026 umbrella review found exercise improves self-rated thinking more consistently than test scores.

A 2026 randomized trial of 100 people having lung cancer treatment tested a 12-week supported food program with coaching, self-monitoring, and follow-up. It found MoCA thinking-test scores improved 2.63 points more than with standard counseling. The result applies to that program and group. It doesn't show that one food, antioxidant, or supplement treats chemo brain.

How childhood treatment, adult age, sex, menopause, hormone treatment, and brain-directed therapy change follow-up.

Children and teenagers may need long-term thinking and school follow-up after some cancer treatments. This is more likely after a brain tumor, acute lymphoblastic leukemia, brain radiation, chemotherapy placed into spinal fluid, or certain high-dose treatments.

Younger age during childhood brain-directed treatment can increase the risk of later learning, attention, processing-speed, and memory problems. Adult screening rules don't apply to a child.

Older adults may have pre-existing memory change, frailty, hearing loss, vision loss, multiple medicines, or dementia risk. A baseline comparison and geriatric oncology assessment can help.

Cancer-related thinking changes can affect people of any sex. Menopause, ovarian suppression, breast-cancer hormone therapy, testosterone suppression for prostate cancer, and sleep-disrupting hot flashes can change the assessment.

Pregnancy and recent childbirth affect cancer treatment, scans, sleep, anemia, thyroid function, medicines, and rehabilitation. Involve the cancer and maternity teams together.

Brain tumors, brain surgery, brain radiation, spinal-fluid treatment, stem-cell transplant, and CAR-T therapy need follow-up matched to the treatment and neurological risks.

If the answer is no

If your cancer team will not order a brain scan or formal cognitive test

Doctors first review when your thinking changed, how it affects daily life, your cancer treatment, and your medicines. The National Cancer Institute says no short test covers every thinking skill. It recommends a focused assessment before full brain testing. Your symptoms and exam decide whether a scan or specialist test would help.

What changes the answer

  • Show what changed from your own baseline. Bring examples involving work, appointments, finances, word finding or following instructions, together with when they began relative to treatment.
  • Bring the full treatment and medication list. Cancer type, treatment dates, current medicines, pain, sleep and mood can all affect which causes the team checks first.
  • Ask which reversible causes the team checks. Request a clear review of medicines, medical conditions and symptoms that can worsen thinking before assuming one treatment caused everything.
  • Request a referral when thinking problems clearly affect daily life. Ask whether neuropsychology, occupational therapy, rehabilitation or another specialist could document them and support you, even if you don't need a scan.
National Cancer Institute: cognitive impairment in adults with cancer

United States, United Kingdom, and Australia

Where to seek cancer-related cognitive care.

US United States

Contact the oncology or survivorship team. Bring treatment dates, medicines, blood results, symptom dates, and two unsafe or difficult tasks. Ask which reversible causes and neurological concerns need checking.

  • Tell the oncology team when thinking changes affect daily life, treatment instructions, medicine use, driving, work, school, or safety.
  • Review cancer status, treatment exposure, medicines, anemia, infection, sleep, pain, nutrition, mood, and neurological symptoms before labeling the cause.
  • Ask about a cancer survivorship service and a full thinking assessment. Rehabilitation, occupational therapy, speech and language therapy, or written work and school support may also help.
Read National Cancer Institute and American Cancer Society cognitive side-effect guidance
UK United Kingdom

Tell the cancer team or GP. Take treatment and medicine lists, blood results, symptom dates, work or school problems, and safety concerns. Ask which medical and rehabilitation reviews are available.

  • Tell the cancer doctor, specialist nurse, treatment helpline, or GP about memory and concentration changes.
  • Ask for a medicine and medical review, including anemia, infection, sleep, pain, nutrition, mood, menopause symptoms, and neurological changes.
  • Ask the NHS cancer team about rehabilitation and a full thinking assessment. Occupational therapy, speech and language therapy, work support, and some charity services may also be available.
Read Macmillan and Cancer Research UK cognitive-change guidance
AU Australia

Contact the cancer team or GP. Bring treatment names and dates, medicines, blood results, symptom dates, and daily safety concerns. Ask about reversible causes and cognitive rehabilitation.

  • Tell the treating specialist, cancer nurse, GP, or survivorship service about thinking changes before they become a safety or work problem.
  • Review treatment, medicines, blood counts, sleep, pain, nutrition, mood, hormones, and neurological symptoms.
  • Ask about neuropsychology, cognitive rehabilitation, occupational therapy, psychology, exercise physiology, and Cancer Council practical support.
Read Cancer Council Australia thinking and memory guidance

Safety

Show how it affects daily life

  • Add one hard task a day to your seven-day record: what it was, how long it took, what went wrong, and whether fatigue, pain, sleep, or medicine timing changed it.
  • Use one calendar and medicine list. Set alarms, keep important items in one place, reduce distractions, and complete one task before starting another.
  • Do demanding work at the time of day when you are clearest. Schedule breaks before exhaustion and ask the cancer team how to increase activity safely.
  • Ask another adult to check medicines, cooking, transport, childcare, bills, or appointments when errors could cause harm. This support can be temporary.
  • Do not test yourself by driving, skipping sleep, stopping medicines, fasting, taking unapproved supplements, or pushing through severe fatigue.
  • At follow-up, compare daily tasks with treatment dates, medicines, sleep, pain, blood results, mood, rehabilitation, and any neurological findings.

Source checked

Sources behind this handout.

  1. National Cancer Institute. Cognitive impairment in adults with cancer, patient version. Updated November 25, 2024.

    Source

  2. National Cancer Institute. Cognitive impairment in adults with cancer, health professional version. Assessment, reversible factors, and interventions.

    Source

  3. National Cancer Institute. Late effects of treatment for childhood cancer. Cognitive, educational, neurological, and lifelong follow-up needs.

    Source

  4. American Cancer Society. Changes in memory, thinking, and focus during and after cancer care.

    Source

  5. Leskinen S et al. Chemotherapy-related cognitive impairment and neural network changes. Systematic review. Neurology. 2025. PMID: 39804577.

    Source

  6. Salgado-Blanco C et al. Cognitive training for cancer-related cognitive impairment. Systematic review and meta-analysis. 2026. PMID: 42081059.

    Source

  7. Dosa N et al. Non-drug nervous-system interventions for chemotherapy-related cognitive impairment. Systematic review. Frontiers in Psychiatry. 2026. PMID: 42311573.

    Source

  8. Macmillan Cancer Support. Cancer-related cognitive changes, causes, coping, and support.

    Source

  9. Cancer Research UK. Cognitive changes during and after cancer treatment.

    Source

  10. Cancer Council Australia. Cancer-related changes in thinking and memory. Updated 2026.

    Source

  11. Cancer Council Australia. Understanding Changes in Thinking and Memory. 2026 patient fact sheet.

    Source

  12. Cheung YT et al. Assessment and Management of Cancer-Related Cognitive Impairment. ASCO Educational Book. 2026;46(3):e517676. PMID 42208004.

    Source

  13. Huang Z et al. 12-week structured antioxidant-focused dietary intervention in lung cancer patients with cancer-related cognitive impairment. Randomized controlled trial. Antioxidants (Basel). 2026;15(8):932. PMID 42650196.

    Source

  14. Gómez-Almeida F et al. Effects of exercise on cancer-related cognitive impairment. Umbrella review. Psychooncology. 2026;35(6):e70507. PMID 42216867.

    Source