Nausea and vomiting in pregnancy should be considered whether it is caused by early pregnancy reaction or peptic ulcer or viral hepatitis. 1. Early pregnancy reaction: usually appears around 4 to 6 weeks after menopause. It may be related to the change of hormone level in the body, mental factors, gastrointestinal tract dysfunction. The severity of individual differences, most of them can be stopped by themselves in about 12 weeks, generally do not need special treatment. 2. Peptic ulcer: the pressure in the gastrointestinal tract is greater than the pressure in the esophagus, and as the months of pregnancy increase, the pressure in the abdominal cavity gradually increases, the imbalance of pressure leads to the occurrence of nausea and vomiting. 3. Viral hepatitis: pregnant women during pregnancy are sensitive to oily reactions, and pregnant women with viral hepatitis have decreased digestive function and abnormal bile secretion leading to indigestion and nausea, vomiting symptoms. If the above symptoms occur and the condition worsens without relief, you should consult a doctor in time and standardize the use of medication under the guidance of the doctor to avoid damage to the fetus.