If a woman still has nausea and vomiting after menstruation, the following two possibilities are considered: First, the patient’s bleeding is not a normal menstruation, but a pre-eclampsia or ectopic pregnancy, which is generally considered to be vaginal bleeding caused by abnormal pregnancy, while the patient’s body blood HCG level is high, so the patient will have nausea, vomiting and other gastrointestinal reactions caused by fluctuations in hormone levels. In this case, the amount of vaginal bleeding is usually small and may be accompanied by abdominal pain, cramping or other discomfort. Secondly, patients with normal menstrual flow and gastrointestinal disorders, such as gastritis or gastric ulcer, may suffer from nausea and vomiting. In this case, the amount of vaginal bleeding is normal, and in addition to nausea, there is an increase in gas and abnormal stools.