Sudden stomach pain in pregnant women is related to miscarriage, ectopic pregnancy, preterm labor, gastroenteritis and other causes, and should seek medical attention to clarify the cause of the disease and standardize the treatment. 1. Miscarriage and ectopic pregnancy: in the early stages of pregnancy, preeclampsia may lead to sudden stomach pain in pregnant women, which should be actively carried out to protect the fetus, and if the miscarriage is unavoidable, the uterus can be cleared. There may also be ectopic pregnancy, we should go to the hospital in time, follow the doctor’s advice to take conservative treatment or surgical treatment, once the rupture will be life-threatening. 2. Preterm labor: preterm labor caused by pregnant women with sudden stomach pain, you can follow the doctor’s instructions intravenous drip into the birth control drugs, such as magnesium sulfate, in order to ensure the safety of the mother and fetus, try to keep the baby to 34 weeks; if necessary, need to terminate the pregnancy by caesarean section. 3. Gastroenteritis: Pregnant women may have gastroenteritis due to improper diet or consuming raw and cold food, and may also have vomiting and diarrhea and other symptoms. Sudden stomach pain in pregnant women should be taken seriously, there may also be other reasons, we should consult a doctor in time, according to the cause of the treatment, so as not to threaten the life and health of the pregnant woman and the fetus.