First, physiological abdominal pain, such as an enlarged uterus, pulling the surrounding ligaments will lead to stomach pain, this type of stomach pain mainly occurs when getting up, bending posture change, in addition to other parts of the pregnant woman’s body ligament stretching will also cause stomach pain. These types of stomach pains do not need special treatment, they are normal phenomena. Second, uterine fibroids, uterine fibroids caused by abdominal pain, usually suddenly appear, and is localized pain. It is also a fixed pain in a certain place, this kind of situation needs timely medical attention. Third, ovarian tumors, ovarian tumors can also cause abdominal pain, mainly manifested as colic, abdominal discomfort, abdominal abnormal enlargement, etc., such cases also need to go to the hospital immediately for medical treatment. Fourth, ectopic pregnancy, if the third trimester stomach pain and accompanied by vaginal bleeding, it is likely to be ectopic pregnancy, which is a serious threat to the health of pregnant women, need to go to the hospital immediately to confirm the diagnosis and rescue. Fifth, pre-eclampsia, abdominal pain in the third trimester, may also be pre-eclampsia, the main symptom is a slight lower abdominal pain, and the pain is paroxysmal, this situation should be promptly to seek medical attention.