Musculoskeletal

Chronic fatigue syndrome (ME/CFS)

Myalgic encephalomyelitis or chronic fatigue syndrome (ME/CFS) is a disabling long-term illness diagnosed from a characteristic symptom pattern, especially post-exertional malaise, after assessment for alternative and coexisting conditions; management is person-led energy management and symptom support, not fixed graded exercise.

In a nutshell

ME/CFS is a disabling long-term illness with debilitating fatigue, post-exertional malaise, unrefreshing sleep or sleep disturbance, cognitive difficulty and substantial reduction in function. NICE recommends suspecting it after 6 weeks in adults or 4 weeks in children and young people, confirming after 3 months when another condition does not explain the pattern, and starting personalised support earlier. Use flexible person-led energy management, not fixed graded exercise therapy; treat symptoms and comorbidities, adapt care for severe illness and review new symptoms rather than attributing them automatically to ME/CFS.

Classic presentation

A person has a major reduction in activity with delayed, disproportionate and prolonged worsening after modest physical or cognitive effort, unrefreshing sleep and brain fog. Examine and perform NICE baseline tests, provide interim energy-management advice, and confirm the diagnosis at 3 months if the full pattern persists.

Key points

The 4 core symptoms are debilitating fatigue, post-exertional malaise, unrefreshing sleep or sleep disturbance, and cognitive difficulties, with substantial functional reduction.
Suspect ME/CFS after 6 weeks in adults or 4 weeks in children and young people; confirm after 3 months when another condition does not explain the symptoms.
Use NICE baseline tests to assess alternative or coexisting conditions; there is no confirmatory diagnostic test.
Energy management is flexible and person-led across physical, cognitive, emotional and social activity; the energy limit fluctuates.
Do not offer graded exercise therapy, fixed activity increments, push-through advice or a general deconditioning-based programme.
CBT may support coping and adjustment if wanted and delivered by an ME/CFS-trained therapist; it is not curative and must not impose activity increases.
Severe or very severe illness needs adapted home or remote care, sensory and communication adjustments, nutrition, swallowing, pressure, orthostatic, safeguarding and carer assessment.

First-line investigation

History and examination for all 4 core symptoms, post-exertional pattern and functional reduction, with the NICE baseline tests and targeted investigation of red flags or new symptoms.

Management

Recognise risk and avoid harmful advice

Assess suicidal ideation, self-neglect, safeguarding, nutrition, hydration, swallowing, orthostatic symptoms and carer capacity; provide early symptom and energy-management advice while diagnostic assessment continues.^1,2
Do not tell the person to push through, exercise more or follow fixed activity increments; activity advice that triggers post-exertional worsening can cause harm.^1,4

Assess the pattern and alternative diagnoses

Document the 4 core symptoms, delayed post-exertional worsening, functional reduction, duration, examination and NICE baseline tests; suspect after 6 weeks in adults or 4 weeks in children and young people and confirm after 3 months if not explained by another condition.^1,3

Use person-led energy management and symptom care

Plan activity and rest across physical, cognitive, emotional and social demands within a fluctuating energy limit; adjust down during flares, and consider any increase only after stability and with specialist support.^1,4
Treat pain, sleep, orthostatic and other symptoms through the relevant current pathway; offer supportive CBT only if wanted, explain that it is not curative, and do not impose exercise progression.^1,4,6

Adapt care and review change

For severe or very severe illness, adapt communication and environment, consider home care, and assess nutrition, swallowing, pressure injury, mobility, orthostatic intolerance, safeguarding and carers.^1,2
Review flares, relapses, function, work or education, medicines and comorbidities; investigate new or changing symptoms and consider post-COVID syndrome through NG188 rather than attributing everything to ME/CFS.^1,5,7

Exam traps

Do not require 6 months before diagnosis: NICE uses 3 months to confirm ME/CFS after the core pattern is present.
Do not call the diagnosis merely one of exclusion; the pattern is assessed positively while alternative and coexisting conditions are investigated.
Do not advise pushing through, going to the gym or fixed incremental exercise; NICE specifically excludes graded exercise therapy.
Pacing or energy management is not a fixed baseline with automatic increases and is not a cure.
CBT is supportive and not based on symptoms being caused by false illness beliefs or deconditioning.
Do not assume a new symptom, deterioration or post-COVID illness is ME/CFS; reassess and use the relevant pathway.
Severe ME/CFS is not simply inactivity: adapt visits, communication, light, sound, nutrition, swallowing, mobility, pressure and carer support.

Key sources

This page is exam revision material, not medical advice, and must not be used for patient care. Always check drug doses against the BNF and current guidance. Full disclaimer.