Extreme fatigue after COVID: what to know

After an infection, energy may return unevenly rather than in a straight line. Ordinary activity can leave you drained later, and concentration, sleep, breathing or mood may also change. Dehydration, poor nutrition, anaemia, another infection or disrupted sleep can prolong weakness. Burnout and alcohol use disorder may worsen rest and recovery. Chronic fatigue syndrome is a distinct diagnosis and cannot be concluded from post-COVID tiredness alone. Ongoing symptoms deserve a broader assessment so that treatable contributors are not missed.

Use pacing: choose a manageable amount of physical or mental activity, rest before you are depleted, and increase demands only when your body tolerates them. Keep meals, fluids and sleep times as regular as possible. Record what you do and how you feel later, because delayed worsening can be easy to overlook. Gentle movement may be suitable for some people, but stop if it causes marked breathlessness, dizziness or a delayed crash. Avoid using alcohol to help sleep, and review medicines with a clinician rather than stopping them yourself.

Arrange a review if fatigue continues to limit work, exercise, personal care or concentration, or if it is worsening instead of gradually easing. Seek urgent help for chest pain, severe breathlessness, fainting, new confusion, blue lips, one-sided weakness or thoughts of self-harm. Prompt assessment is also needed for persistent fever, dehydration, palpitations or a new oxygen concern. A clinician can review your history, examination and appropriate tests.

Ask whether your pattern fits post-infectious fatigue, whether anaemia, thyroid, kidney or sleep problems should be checked, and how to pace activity. Bring your illness timeline, current symptoms, medicines, sleep pattern, fluid intake and examples of delayed worsening.