Mental fatigue and anxiety: what to know

Anxiety keeps the mind alert for possible problems. That ongoing mental strain can make planning, remembering details and making decisions harder. Broken sleep, low mood, too much caffeine, dehydration, alcohol use, or an underlying illness may add to the problem. Fatigue can also occur with anaemia, burnout, chronic fatigue syndrome, chronic kidney disease, coeliac disease, COVID-19 or dehydration; these conditions present with fatigue in different ways and need separate assessment.

Keep a simple record of sleep, worry, energy, medicines and caffeine for several days. Use a regular sleep and wake time, eat at steady intervals, drink fluids, and break demanding tasks into brief periods with pauses. Gentle movement can be useful if it does not worsen symptoms. Try slow breathing or grounding when worry rises. Avoid using alcohol to settle anxiety, because it can disturb sleep and mood. A clinician can review your symptoms, medicines and physical health, and discuss talking therapy or other treatment when appropriate.

Arrange a medical appointment if fatigue lasts, keeps returning, or affects work, study, relationships or self-care. Seek urgent help for new confusion, fainting, severe breathlessness, chest pain, weakness on one side, or thoughts of harming yourself. Contact emergency services if you may act on those thoughts or cannot stay safe.

Ask whether your symptoms suggest anxiety, a sleep problem, low mood or a physical cause; whether any medicine or substance may contribute; which checks are suitable; and what support to use if concentration remains difficult.