What should you know about total loss of appetite?

Appetite can fall during infections such as influenza, COVID-19, gastroenteritis, or hepatitis A. Nausea, stomach irritation, an ulcer, pain, medication effects, low mood, and emotional strain can also reduce eating. Persistent loss with digestive symptoms or unexplained weight change needs a broader assessment; a symptom alone cannot identify a diagnosis.

Take frequent sips of water or an oral rehydration drink if vomiting or diarrhoea is present. Try small, bland meals or nourishing drinks rather than forcing a large plate, and avoid alcohol while unwell. Keep a brief record of intake, urine, vomiting, bowel changes, pain, fever, and medicines. Do not stop prescribed treatment without advice.

Contact a clinician promptly if you cannot keep fluids down, pass very little urine, feel faint, develop severe or persistent abdominal pain, notice yellowing of the skin or eyes, or are losing weight without trying. Emergency help is appropriate for collapse, confusion, blood in vomit or stool, or breathing difficulty.

Could an infection, stomach condition, medicine, or mood change explain this? Do I need tests, a medication review, or help meeting fluid and nutrition needs?