Anxiety and tiredness: what to know

A person may feel mentally drained, physically heavy or unable to concentrate after prolonged worry. Anxiety can also make sleep lighter or more interrupted, even when total time in bed seems adequate.

The body's threat response increases alertness and muscle tension. Maintaining that state consumes energy, while racing thoughts may delay sleep or cause early waking. Avoiding activity because of anxiety can then reduce stamina and reinforce fatigue.

Tiredness is not specific to anxiety. Anaemia, dehydration, infection, medicine effects, thyroid problems, low mood and disrupted breathing during sleep are among the other possibilities. The timing, associated symptoms and effect on daily life help a clinician narrow the cause.

Keep a short record of sleep, caffeine, meals, activity, worry episodes and energy levels. A regular wake time, daylight exposure, gentle movement and scheduled wind-down period can support sleep and reduce the cycle of inactivity.

Arrange a GP appointment if fatigue persists, repeatedly returns or limits work, study, driving or self-care. Bring a medicine and supplement list. Assessment may include questions about sleep, mood, diet, bleeding, alcohol use and physical symptoms, followed by examination or targeted tests when indicated.

Seek urgent medical help for tiredness accompanied by chest pain, severe breathing difficulty, fainting, new confusion, weakness affecting one side, or thoughts of harming yourself. These features require prompt assessment regardless of whether anxiety is present.

Contact a clinician soon if you have unexplained weight change, fever, persistent vomiting, black or bloody stools, unusually heavy bleeding, marked thirst, or worsening symptoms. Do not drive if sleepiness makes it hard to stay alert.

Ask whether your symptom pattern suggests a sleep, mood, nutritional or medical cause; whether any medicine could contribute; what tests are appropriate; and which anxiety treatments fit your circumstances.