Not wanting to eat, nausea and vomiting may be caused by early pregnancy reaction, gastroduodenal disease, hepatobiliary and pancreatic diseases. 1. Early pregnancy reaction: If women of childbearing age have delayed menstruation, pregnancy should be considered. In the early stage of pregnancy, due to the increased secretion of chorionic gonadotropin (HCG) in the pregnant woman’s body, early pregnancy reaction can be caused, resulting in loss of appetite, acidophilic, anorexia, nausea, vomiting, dizziness, fatigue and other symptoms. 2. Gastroduodenal diseases: such as peptic ulcer, acute and chronic gastritis, functional dyspepsia, pyloric obstruction, etc. can cause lack of appetite, nausea, vomiting and other symptoms. 3. Liver, gallbladder and pancreatic diseases: such as acute and chronic viral hepatitis, drug-related liver injury, cirrhosis, acute and chronic cholecystitis, pancreatitis, etc., can also cause lack of appetite, nausea, vomiting and other symptoms. There are many other causes of not wanting to eat, nausea and vomiting, which should be taken seriously, timely consultation, under the guidance of a professional physician to identify the cause of the disease, and follow the medical advice for further treatment or therapy.