When there is a sudden decrease in appetite, consider the following causes: 1. abnormal liver function: when there is liver function damage, the patient’s liver itself has no obvious symptoms, often appearing abdominal distension, loss of appetite, indigestion and other manifestations, you can strengthen liver protection treatment, often given glycyrrhiza sweetener preparations and other comprehensive treatment, when the liver function gradually recovers, appetite will also slowly recover. 2. digestive system diseases: such as acute and chronic gastritis, gastric cancer, gastroesophageal reflux disease, gastric light palsy syndrome and many other diseases, Gastroesophageal reflux disease, gastroparesis syndrome, and many other diseases, can cause loss of appetite, abdominal distension and other uncomfortable symptoms, to give gastroscopy and other examinations, according to the different causes of the corresponding treatment. 3, constipation and abdominal distension: appetite decline, the patient can take oral four mill soup oral liquid, lactulose oral liquid, etc. If the patient has a long time stool excretion function is relatively poor, the upper abdomen will appear full and distended, the diet will be significantly reduced. In addition, electrolyte disorders and early pregnancy, as well as major events leading to depressed mood can cause loss of appetite. Detailed consultation and examination should be given to clarify the cause and treat accordingly.