Pregnancy vomiting may be caused by the following reasons: First, the hormone level in the body increases in early pregnancy, especially the chorionic gonadotropin, which leads to pregnancy vomiting. Secondly, during pregnancy, the sensitivity of the sense of smell to odor increases, and nausea and vomiting may occur due to the smell of abnormal odors. Third, it may be due to psychological reasons. Psychological and emotional changes may also occur during early pregnancy, which may also cause pregnancy vomiting reactions. If the reaction of pregnancy vomiting is serious, you can take vitamin B6 tablets orally as appropriate. It can be effectively relieved. During early pregnancy there may be drowsiness or breast swelling, do not worry too much, it is a normal pregnancy reaction, pregnancy vomiting may be caused by a variety of factors.