At 33 weeks of pregnancy, it belongs to the middle and late stages of pregnancy, when pregnant women have stomach pain, divided into the following cases: First, due to physiological abdominal pain, mainly due to the pain caused by the squeezing and collision of the surrounding tissues after the uterus becomes larger, especially the squeezing of the contact under the rib margin and the upper side of the pubic symphysis, which can cause abdominal pain in many women. In addition, a larger uterus can cause pain as the ligaments around the uterus are stretched and tensed. After the uterus becomes larger, many pregnant women will also experience some degree of pain during contractions due to their greater strength. Second, pathological pain is gynecological inflammation or other diseases, including uterine fibroid degeneration, ovarian cysts and other diseases, also not excluding preterm labor. Third, abdominal pain in the middle and late stages of pregnancy may also be caused by intestinal diseases, with enteritis, intestinal spasm, or even the presence of intestinal obstruction. Therefore, pregnant women with more serious and suspicious pathological pain should go to the hospital in time for detailed examination and symptomatic treatment.