There are two situations: 1. Pregnant women who have sexual intercourse: Some women are prone to mild abdominal pain in the early stages of pregnancy, similar to menstrual cramps, accompanied by menstrual overload, and it is advisable to go to the hospital to have blood tests for human chorionic gonadotropin to determine whether they are pregnant. If pregnancy is diagnosed and abdominal pain occurs at the same time, attention should be paid to rest and fetal preservation treatment to avoid miscarriage.2. Women with a history of dysmenorrhea: In the premenstrual period, the level of prostaglandins in the body rises, leading to spasmodic contraction of the smooth muscle of the uterus causing dysmenorrhea. Since the estrogen in the body is at a high level and there is no downward trend, menstruation has not yet arrived. This type of dysmenorrhea is commonly seen in patients with primary dysmenorrhea and is caused by hypersensitivity to prostaglandins.