Most nausea is caused by problems in the gastrointestinal tract, such as the more common gastroesophageal reflux disease, acute gastritis, chronic gastritis, peptic ulcer, and malignant tumors of the gastrointestinal tract. Nausea may also be caused by other acute abdominal conditions, such as acute pancreatitis, chronic pancreatitis, cholecystitis, appendicitis, intestinal obstruction, etc. It may also be caused by other chronic diseases, such as the more common cardiovascular diseases, including cerebral infarction, heart disease, hypertension, diabetes, etc. Early pregnancy reactions also often show symptoms of nausea, which should also be ruled out. Regardless of the cause of nausea, it is recommended that if the symptoms are serious and accompanied by other uncomfortable symptoms, you should seek medical attention in a timely manner.