Mayo Clinic Talks Myalgic Encephalomyelitis/Chronic Fatigue Syndrome
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Aug 11, 2026 Stephanie L. Grach, an internist who manages complex chronic conditions including myalgic encephalomyelitis/chronic fatigue syndrome. She explains the name change and history. She explores overlaps with long COVID and proposed post-infectious and immune mechanisms. She describes hallmark post-exertional symptom worsening, diagnosis challenges, pacing-focused management, common meds used, and building trust with patients.
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Name Change Reframes The Condition
- The name ME-CFS restores the original myalgic encephalomyelitis term and emphasizes possible neuroinflammation rather than the vague symptom label chronic fatigue syndrome.
- ME predated CFS historically, WHO recognized it as neurological in 1969, and CFS arose later around 1988 as a symptom-based term.
Pandemic Sparked New Understanding
- COVID-19 accelerated research and awareness because ME-CFS commonly follows infections and overlaps with other post-infectious conditions like long COVID.
- This increased attention clarified ME-CFS as a multisystem illness with common comorbidities and shifted management thinking away from graded exercise.
Post-Infectious Trigger Is Most Common
- Most ME-CFS cases appear to be post-viral or post-infectious with estimates that 70–80% are triggered this way.
- Other triggers exist but the immune/neurologic cascade after infection is the dominant pathway discussed.