There are many reasons for the lack of appetite for food and nausea and vomiting, and some problems of the gastrointestinal tract and some diseases of the non-gastrointestinal tract may occur. The specific include the following: 1, gastrointestinal tract dysfunction may appear these symptoms, including the usual consumption of irritating food, such as eating spicy, greasy food, may appear these symptoms; 2, gastrointestinal tract diseases, including gastritis, gastroesophageal reflux disease and peptic ulcer and other diseases may appear these symptoms; 3, there are some fever or cold, may cause gastrointestinal symptoms; 4. Some patients during pregnancy may have nausea and vomiting symptoms; 5. Some non-gastrointestinal diseases, such as cardiovascular diseases, including poor heart function, or insufficient blood supply to the brain, also need to be taken into consideration, and these conditions may occur. Therefore, when nausea and vomiting occur, it is best to go to a standardized hospital for consultation to clarify the cause for better treatment.