Feeling weak and loss of appetite

A short illness may reduce appetite while your body uses energy to recover. Influenza, COVID-19, gastroenteritis, and Hepatitis A can also cause tiredness with nausea, fever, stomach upset, or changes in taste. Gastritis and peptic ulcer disease may make eating uncomfortable. Depression can affect appetite, sleep, motivation, and energy. Less commonly, ongoing appetite loss with weakness needs assessment for a deeper medical problem, including pancreatic cancer; this symptom alone does not identify a diagnosis.

Sip fluids regularly and choose small, nourishing meals or snacks when a full meal feels difficult. Try bland foods if nausea or stomach irritation is present, and avoid alcohol until the cause is clearer. Rest, record your temperature and symptoms, and note any weight change, vomiting, diarrhoea, pain, or medicine that may have affected appetite. Arrange a medical appointment if the problem persists, keeps returning, or makes normal activities difficult.

Seek urgent medical help for confusion, fainting, severe weakness, trouble breathing, severe abdominal pain, blood in vomit or stool, or inability to keep fluids down. Prompt assessment is also sensible for yellowing of the skin or eyes, very dark urine, marked drowsiness, or rapidly worsening symptoms. A clinician can examine you and choose tests based on the pattern rather than the appetite change alone.

Ask which symptoms are most useful to track, whether medicines or an infection could explain the change, and whether you need blood tests or other checks. Tell the clinician when the weakness began, what you can eat and drink, and whether mood, pain, bowel changes, or fever have changed.