Vomiting after 30 weeks of pregnancy may be due to pathologic causes (e.g., gastrointestinal diseases, liver-related diseases, etc.), or it may be caused by the growing uterus pressing on the gastrointestinal tract in late pregnancy and pregnancy reactions. If you still have vomiting in late pregnancy, first of all, you should have regular checkups at the hospital to rule out pathological causes, such as gastrointestinal diseases, liver-related diseases, and so on. It may be caused by the enlarged uterus pressing on the gastrointestinal tract in late pregnancy, or it may be caused by a reaction to pregnancy. Pregnancy reactions vary widely among pregnant women, with most of them resolving gradually after 12 weeks, and some of them may persist throughout the pregnancy. Most of these reactions do not require treatment, but when they worsen, the woman loses significant weight or her general condition is poor, she should be hospitalized to assess whether hospitalization is necessary to avoid serious consequences.