What should you know about constant loss of appetite?

Poor appetite can happen during infections such as influenza, COVID-19, gastroenteritis, or hepatitis A, particularly when nausea, fever, tiredness, or altered taste is present. Gastritis and peptic ulcer disease may make eating uncomfortable, while depression can reduce interest in food and affect sleep, motivation, or mood. Less common but important illnesses, including pancreatic cancer, may also affect appetite alongside other persistent changes. Appetite loss is a symptom rather than a diagnosis, and its meaning depends on the full pattern.

Keep a simple record of what you eat and drink, nausea, pain, bowel changes, fever, mood, and any new medicines. Choose small, frequent meals with familiar foods and sip fluids regularly; nourishing drinks may be easier than a full meal when appetite is low. Avoid forcing food if you are vomiting, but seek advice if you cannot maintain fluids. Do not stop prescribed medicines without discussing possible appetite effects with a clinician.

Arrange a medical review if appetite loss persists, causes weakness, or makes it difficult to eat and drink. Seek urgent help for confusion, fainting, severe dehydration, vomiting blood, black stools, severe abdominal pain, yellowing of the skin or eyes, or inability to keep fluids down. Tell a clinician promptly about unintended body changes, persistent fever, or new mood symptoms.

Ask what examinations or tests may clarify the cause, whether a medicine could be contributing, and how to protect nutrition and hydration. Share your symptom timeline, medical history, mood changes, alcohol intake, and any digestive or urinary changes.