Fatigue persisting for weeks or months after a viral illness is common and, for some people, disabling. The critical feature to identify is post-exertional malaise — a delayed crash after activity, often a day later. Where that is present, the usual advice to gradually build exercise is wrong and will make things worse. Pacing comes first, and only then, cautiously, does capacity get rebuilt.

Does this sound like you?

Most people have several of these, not all of them.

Fatigue disproportionate to activity, not relieved by rest
A delayed crash a day or so after exertion
Difficulty concentrating and remembering
Dizziness or palpitations on standing
Aching muscles and headaches

Why it happens

Viral infections including COVID-19, influenza and glandular fever
A prolonged or severe acute illness
Sleep disruption during and after the infection
Deconditioning from an extended period of rest
Autonomic changes affecting heart rate and blood pressure on standing

What we would do about it

Roughly in this order — each step waits for the one before it.

Identifying post-exertional malaise first, because it changes everything that follows
Pacing and activity management within your current energy envelope
Breathing pattern retraining, which is frequently disrupted after illness
Position and hydration strategies where standing provokes symptoms
Very gradual reintroduction of activity, only once stable
Working with your GP, since other causes need excluding

See a doctor first if

Your pain followed a significant injury
It is getting worse rather than settling
It comes with numbness, weakness or unexplained weight loss

This page is general information, not a diagnosis. Symptoms overlap between conditions, so the right treatment depends on an assessment.

Pushing through is the wrong advice here

If activity leaves you flattened the next day, a standard graded exercise program will set you back. Pacing first is the safer and more effective route.

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Other chronic conditions we treat

Persistent Pain Fibromyalgia Osteoarthritis Rheumatoid Arthritis

Back to all chronic conditions

General information only, not advice about your own problem — nothing here replaces an assessment. Source: Chronic Fatigue Syndrome on Physiopedia.

Post-Viral Fatigue