If ectopic pregnancy causes sudden and severe pain in the stomach, emergency surgery is needed; if it is caused by inevitable abortion, timely removal of the uterus is needed; if it is caused by placenta previa, timely termination of pregnancy is needed. 1. Ectopic pregnancy: a common obstetrics and gynecology emergency surgery, when the rupture of the pregnancy site will suddenly cause severe pain in the lower abdomen, through the history of menopause, ultrasonography and other definitive diagnosis, the need for emergency surgery to ensure the safety of the pregnant woman’s life. 2. Inevitable miscarriage: there are symptoms of preeclampsia, on the basis of which there are symptoms such as worsening of lower abdominal pain and increased vaginal bleeding, etc. The combination of clinical manifestations, ultrasound and gynecological examination can assist in the diagnosis. Once it is clear, it is necessary to carry out a timely purging operation, and give medication to promote contraction therapy, such as oxytocin. 3. Placental abruption: mostly occurs in late pregnancy, it can also cause sudden onset of severe lower abdominal pain, accompanied by obvious uterine pressure pain, fetal heart rate slows down or disappears, combined with clinical manifestations, ultrasonography and physical examination can assist in the diagnosis. Once the diagnosis is clear, emergency termination of pregnancy and preparation for neonatal resuscitation are required. When pregnant stomach suddenly severe pain, need to go to the hospital in time to identify the cause, and timely treatment.