Nausea is always related to indigestion, hepatitis, pyloric obstruction, stomach cancer, pregnancy and other factors, as follows: 1. When the human body has indigestion, not only will it show a loss of appetite, poor appetite, and after the intake of food will also appear early satiety phenomenon. After ingestion of food into the body, the stomach is not able to digest and empty the food in time, so it will cause pressure on the stomach wall, resulting in nausea, vomiting and other symptoms. 2, after suffering from hepatitis disease due to impaired liver function, unable to metabolize the toxins in the body, and the digestion of protein and fatty foods in the food will be impaired, so there will be nausea, vomiting, aversion to grease, weakness and other symptoms. 3. Some patients vomit at night, mainly because they vomit out the food they consumed during the day, which is caused by pyloric obstruction. 5. When women of childbearing age often experience nausea in the morning, it is mostly caused by pregnancy, which is directly related to the stimulation of digestive system by hormone secretion.