Miscarriage usually causes abdominal pain. When a pregnant woman has a miscarriage, pain can be caused by paroxysmal contractions of the uterus. If the miscarriage occurs before the 12th week of gestation, it is called early miscarriage and it starts with bleeding, then the embryo separates from the uterus and the blood clots left in the uterine cavity stimulate the uterus to contract and cause paroxysmal lower abdominal pain. If the miscarriage occurs between 12 and less than 28 weeks of gestation, it is called late miscarriage, and there are paroxysmal uterine contractions first, followed by placental abruption, so abdominal pain is followed by vaginal bleeding. Miscarriage is divided into surgical abortion, medication abortion, midterm induction and spontaneous abortion. Whether it is surgical abortion, medication abortion, midterm induction or spontaneous abortion, all will cause abdominal pain due to contractions. Nowadays, many hospitals provide painless abortion services and patients do not feel pain during the abortion. However, it is normal to feel uterine distension and discomfort after the procedure. If you feel severe and persistent abdominal pain that cannot be relieved after abortion, you should consult a doctor in time, except for surgical complications, such as the possibility of uterine perforation and infection, and give symptomatic treatment.