Belching and lack of appetite need to consider physiological and pathological causes. Physiological causes include early pregnancy reaction, irregular diet, emotional depression, etc. Pathological causes include gastric and duodenitis, cholecystitis, hepatitis, etc., such as taking non-steroidal anti-inflammatory drugs, antibiotics and other drugs can also be caused. 1. Physiological causes: such as women of childbearing age who have sex need to consider the early pregnancy reaction, which is related to the hormonal changes in the early stages of pregnancy; such as irregular diet, depression can affect the gastrointestinal tract peristalsis and digestive function. 2. Pathological causes: ① disease causes: such as stomach and duodenitis can also have acid reflux, heartburn and other symptoms; such as cholecystitis can also have fever, anorexia and other symptoms; hepatitis can also have fatigue, jaundice and other symptoms. ② drug causes: some drugs can affect the gastrointestinal tract digestive function. Such as ibuprofen, indomethacin and other non-steroidal anti-inflammatory drugs; such as azithromycin, levofloxacin and other antibiotics. For the reasons of belching and lack of appetite, it is recommended to consult a doctor to determine according to the relevant examination.