Useful when …
when fatigue, PEM, sleep problems, pain, or cognitive symptoms occur together
when symptoms have persisted for months and need clearer documentation
when you want to see whether your pattern appears ME/CFS-oriented
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A free ME/CFS self-test and symptom check structured against the Canadian Consensus Criteria. It helps with orientation when exertion, recovery, and PEM are hard to interpret.
The check organizes core symptom clusters such as post-exertional worsening, sleep, pain, and cognitive symptoms against the Canadian Consensus Criteria.
It is most useful when symptoms have persisted for months, worsen after exertion, and need clearer language for self-documentation or a clinician discussion.
It does not diagnose ME/CFS, does not replace exclusion diagnostics, and is not meant to assess urgent red-flag symptoms.
Symptoms must have persisted for at least six months with significant impairment of functional capacity.
Worsening after physical or cognitive exertion – often delayed 12–48 hours, disproportionately severe, and prolonged.
Unrefreshing sleep, altered sleep architecture, or hypersomnia – sleep does not relieve the fatigue.
Muscle and joint pain, headaches, or diffuse pain that cannot be clearly attributed to another cause.
Brain fog, concentration difficulties, word-finding problems, memory issues – at least two of these must be present.
Before you start – the most important answers at a glance.
No. It structures symptoms against known criteria. ME/CFS is a diagnosis of exclusion and requires medical assessment.
It is useful when fatigue, post-exertional worsening, sleep problems, pain, or cognitive symptoms appear together and you want to clarify the pattern.
PEM changes interpretation because symptoms can worsen disproportionately and with delay after physical, cognitive, or emotional exertion.
A useful online check should separate PEM, sleep, pain, cognitive symptoms, and autonomic, neuroendocrine, or immune symptoms. It should also state clearly that it does not diagnose ME/CFS.
The ME/CFS symptom check structures symptom patterns against clinical criteria. FUNCAP-27 describes functional capacity, daily limits, and severity over time.
Fatigue occurs in many conditions. For ME/CFS, the pattern with PEM, reduced capacity, sleep, pain, and neurocognitive symptoms is more relevant.
Free, anonymous, in a few minutes. Structure your symptoms for your next medical appointment.