The causes of abdominal distension after coitus in pregnancy include: First, uterine contraction due to large amplitude of movement or long time during coitus in pregnancy. Secondly, it may be due to the cold in the abdomen during coitus, resulting in bloating and other digestive discomforts. When a woman is pregnant, the action must be gentle, not too rough, and the time should be short, but also pay attention to keep warm, not to have indigestion. The frequent occurrence of abdominal distension after pregnancy may lead to vaginal bleeding and other preeclampsia, women in the early and late pregnancy need to prohibit coitus, only in the mid-pregnancy can be a small amount of coitus to avoid miscarriage.