Why does COVID-19 cause fatigue?

Fatigue is a very common presentation of COVID-19. It can feel like unusual tiredness, low stamina, heaviness, or difficulty concentrating rather than ordinary sleepiness.

Energy can fluctuate during and after an infection. Trying to catch up on everything on a better day may leave you more depleted afterwards, so it can help to spread essential tasks across the day.

Fatigue also has many causes beyond COVID-19, including poor sleep, stress, medication effects, anaemia, and other illnesses. New, severe, or persistent fatigue should be reviewed instead of being automatically attributed to a recent infection.

Prioritise rest, regular fluids if suitable for you, nourishing meals, and a consistent sleep routine. Choose gentle activity only when it feels manageable, increasing it gradually rather than pushing through marked exhaustion.

Keep a short note of energy, sleep, symptoms, and daily activities. This can show patterns and gives a clinician practical information if fatigue is affecting work, caring responsibilities, or basic self-care.

Contact a clinician if fatigue is getting worse, is preventing drinking or basic daily care, or comes with new symptoms that concern you. Seek emergency help for difficulty breathing, chest pain, fainting, new confusion, blue or grey lips, or trouble staying awake.

Ask whether your pattern of fatigue needs examination or tests, how to pace return to work or exercise, and which symptoms would require more urgent review. Take your symptom notes and a list of current medicines.