Sudden loss of appetite for days: what to know

COVID-19, influenza, gastroenteritis, and hepatitis A may reduce appetite while the body is unwell. Nausea, burning pain, or discomfort after eating may point toward gastritis or a peptic ulcer. Depression can affect appetite along with mood, sleep, motivation, and enjoyment. The duration, associated symptoms, and ability to drink are more useful than appetite loss by itself when considering what to do.

Ask yourself whether you have fever, congestion, diarrhoea, vomiting, abdominal pain, jaundice, mouth soreness, or a recent medicine change. These details help distinguish a passing illness from a problem that needs review.

Prioritise fluids in frequent small sips. Try bland or familiar foods in small portions, and add more substantial foods as tolerated. Rest, wash your hands carefully if vomiting or diarrhoea is present, and avoid alcohol when you feel unwell. Keep a simple record of drinks, meals, temperature, and symptoms.

Contact a clinician if appetite does not begin to improve, if symptoms are worsening, or if you have a medical condition that makes dehydration or poor intake more concerning. Mention all medicines, including non-prescription products.

Get urgent help if you cannot keep fluids down, pass very little urine, feel faint or confused, have severe abdominal pain, blood in vomit or stool, black stools, breathing difficulty, or yellow skin or eyes. Seek prompt review for ongoing appetite loss, marked weakness, or unplanned weight loss.

Could an infection, stomach condition, medicine, or mood change explain this? How should I replace fluids and food? Do my other health conditions alter the advice? What symptoms require same-day care?