Energy limiting conditions (ME/CFS/Long COVID/fibromyalgia)

Energy limiting conditions (ELCs) are long-term conditions where fatigue and energy impairment are the defining features, limiting the overall amount and pace of activity a person can do, their daily function and quality of life.

Conditions covered by this pathway:

Myalgic Encephalomyelitis / Chronic Fatigue Syndrome (ME/CFS) — profound fatigue, sleep disturbance and post-exertional malaise
Long COVID — persistent, debilitating symptoms following SARS-CoV-2 infection
Fibromyalgia — widespread musculoskeletal pain with significant fatigue and fluctuating symptoms

Key characteristics:

Energy impairment — more than tiredness; a severe lack of energy that limits basic tasks
Fluctuating symptoms — severity may vary hourly, daily or weekly
Post-exertional malaise (PEM) — marked worsening after minimal physical, cognitive or emotional exertion
Cognitive dysfunction ("brain fog") — problems with memory, concentration and processing

Post Exertional Malaise management. Symptom worsening after exertion is often delayed by 24–48 hours and recovery is prolonged. If PEM is present, do not advise patients to "push through" or exercise their way out of symptoms.

Assessment

These are clinical diagnoses — GPs can and should make them.

There is no diagnostic test and no requirement for specialist confirmation. Just clearly making a diagnosis is itself therapeutic, prevents repeated investigation, and allows the patient to focus on management (including ELC pathway)

Step 1 — History and examination

Fatigue pattern: relationship to activity, effect of rest, delayed worsening after exertion (PEM)
Sleep quality (unrefreshing sleep), cognitive symptoms, pain distribution
For long COVID: timeline from acute infection; symptom list is broad (breathlessness, palpitations, dizziness, chest tightness, brain fog)
Impact on function: work, self-care, mobility
Screen for mimics and contributors: depression/anxiety, sleep apnoea (snoring, BMI, Epworth), menopause, alcohol, medication causes (beta-blockers, statins, sedating drugs)

Step 2 — One blood panel excludes the common alternatives (all three conditions)

FBC, U&E, LFT, TFT, CRP (and/or ESR), calcium & phosphate, HbA1c, ferritin, coeliac screen, urinalysis
Add CK if widespread pain or muscle weakness
Consider if indicated: vitamin D, B12/folate, BNP (breathless post-COVID), HIV/hepatitis serology

If these results are normal with a typical clinical picture, make the diagnosis. Do not serially re-investigate stable, typical symptoms.

Step 3 — Apply the condition-specific criteria

Simplified diagnostic criteria

ME/CFS (NICE NG206)

All 4 must be present:
- Debilitating fatigue, worsened by activity, not relieved by rest
- Post-exertional malaise (often delayed 24–48h)
- Unrefreshing sleep
- Cognitive difficulties
Suspect at 6 weeks of symptoms
Diagnose at 3 months if not explained by another condition

Long COVID (NICE NG188)

Signs/symptoms continuing 4–12 weeks after acute COVID-19 = ongoing symptomatic COVID-19
Beyond 12 weeks, not explained by an alternative diagnosis = post-COVID-19 syndrome
Targeted checks:
- 1-minute sit-to-stand test with oxygen saturations (desaturation ≥3% is abnormal)
- Lying & standing BP/HR if dizziness or palpitations on standing
- CXR by 12 weeks if ongoing respiratory symptoms

Fibromyalgia (RCP 2022)

Pain in ≥4 of 5 body regions (4 quadrants + axial)
Present ≥3 months at a similar level
With fatigue, unrefreshing sleep and cognitive symptoms
Score it with the RCP diagnostic worksheet: WPI ≥7 + SSS ≥5, or WPI 4–6 + SSS ≥9
Diagnosis is valid alongside other conditions (e.g. inflammatory arthritis)

Stop — features suggesting another diagnosis (investigate/refer instead):

Weight loss, fever, night sweats, lymphadenopathy
Focal neurological signs
Inflammatory features: joint swelling, early morning stiffness >1 hour, persistently raised inflammatory markers
Cardiac-sounding chest pain
Hypoxaemia or oxygen desaturation on exertion — urgent referral (NG188)
Significant suicidality or severe self-neglect

Communicating the diagnosis

Name the condition and code it — avoid "we can't find anything wrong"
Explain fluctuation and PEM so the patient can interpret their own symptoms
Give a patient resource at the point of diagnosis (see Resources)

Primary care management

Energy management (all ELCs)

Pacing: plan activity within the current energy envelope, with rest built in — the aim is stability, not pushing limits
Do not offer graded exercise therapy for ME/CFS (explicitly removed in NICE NG206)
For long COVID, increase activity only as tolerated; if PEM is present, manage as for ME/CFS

Symptom management

Sleep: routine sleep advice, but set expectations — sleep is often unrefreshing despite good habits
Fibromyalgia pain: non-drug approaches first (education, activity within limits, psychology-informed approaches). If a drug trial is appropriate, consider low-dose Amitriptyline at night (off-label). Avoid opioids; do not start gabapentinoids routinely
Orthostatic symptoms: fluid and salt advice, slow postural change; check lying/standing BP and HR
Treat coexisting depression/anxiety on their own merits — they are common consequences, not the cause

Practical support

Review and rationalise medications contributing to fatigue
Work/education: fit notes supporting phased return, amended duties, or time off during relapse; signpost occupational health
Regular planned review — particularly for severe ME/CFS (housebound/bedbound patients may need home visits)

Supported self-management and community signposting

DG Doing More — physical activity and clubs across D&G
DGLocator — find local services and third sector support
NHS Inform service directory
Community Link Worker referral for social prescribing and welfare/benefits signposting

Who to refer

Refer to the NHS D&G ELC Pathway when ALL of the following apply:

Adult over 16
Symptoms persisting >12 weeks
ELC diagnosis made after appropriate history and investigations (see Making the diagnosis)
Ongoing functional limitation requiring condition-specific assessment and intervention to improve or maintain function and quality of life
Medically stable
Able to give informed consent and engage with assessment and intervention (with appropriate support) at face-to-face, telephone or home visit appointments

Referral route: SCI Gateway → Mountainhall → Regional Rehab Service → Physio Comm Rehab (AHP Regional Rehab Team)

What the service offers: a multidisciplinary, person-centred team (Occupational Therapy, Physiotherapy, Psychology, with links to Rehabilitation Medicine) providing specialist rehabilitation approaches and supported self-management, including signposting to public health, third sector and community agencies.

Who not to refer

Under 16 — contact child health services instead
Symptoms explained by another diagnosis on history or investigation — manage or refer for that condition
No diagnosis yet made — complete the primary care diagnostic steps first; the pathway does not provide a diagnostic service
Self-managing well with support from Public Health Improvement / Community Link Workers, third sector or leisure services — signpost rather than refer
Medically unstable, or unable to engage with assessment and intervention even with support — address the barrier first