The absence of hunger may be due to physiological or pathological causes. Most physiological causes are due to mental factors and weather problems; most pathological causes are due to gastritis or hepatitis. 1. Physiological reasons: some people may show no hunger in hot summer, or when they are overly nervous. Usually it is a normal physiological situation and does not need special treatment. 2. Gastritis: Gastritis can be divided into acute gastritis and chronic gastritis. Acute gastritis is mostly caused by alcohol, improper diet, and stress; chronic gastritis is mostly caused by Helicobacter pylori infection or autoimmunity decline. Patients will have typical symptoms such as loss of appetite, upset stomach, nausea and vomiting, and no hunger. 3. Hepatitis: Most patients with hepatitis are caused by genetic factors, viral infections, and improper medication. Patients will show symptoms such as nausea and vomiting, body weakness, anorexia, and also show no hunger. When the patient shows no hunger, it is recommended to consult the doctor in time, conduct relevant examinations under the guidance of the doctor, and then treat the symptoms.