Fatigue and lack of appetite: what to know

A short episode can accompany a viral illness such as COVID-19, while ongoing tiredness may be associated with anaemia, coeliac disease, chronic kidney disease, burnout, or chronic fatigue syndrome. Alcohol use disorder can also affect eating patterns, sleep, mood, and energy. These possibilities overlap, so the combination alone cannot identify one cause.

Notice whether appetite changes are linked with nausea, abdominal discomfort, thirst, fever, weight change, low mood, breathlessness, or changes in urine. A clinician may review your history, medicines, hydration, diet, and examination before deciding whether tests are useful.

Take regular sips of fluid and choose small, nourishing portions rather than waiting for a large appetite. Soft foods, soups, yoghurt, eggs, beans, or a simple sandwich may be easier to manage. Keep a brief record of meals, drinks, sleep, symptoms, and medicines, and avoid using alcohol to stimulate appetite.

Rest, but keep gentle movement within your energy limits. Do not start iron or other supplements without advice, because the right treatment depends on the cause.

Arrange a medical review if reduced appetite or fatigue is persistent, worsening, or interfering with normal activities. Seek prompt help for confusion, fainting, severe weakness, inability to keep fluids down, very little urine, chest pain, severe breathlessness, or signs of serious dehydration.

Could my medicines, sleep, mood, diet, or alcohol use be contributing? Which symptoms would make testing for anaemia, kidney problems, or coeliac disease sensible? How can I maintain fluids and nutrition while my appetite is low?