The stomach pains of pregnant women may be caused by false contractions, miscarriage, placental abruption and other reasons. 1. False contractions: During pregnancy, as the uterus gradually increases in size, the ligaments connecting the uterus to the pelvis will also be pulled, resulting in increased tension and causing the symptoms of pregnancy tummy ache, which is a normal physiological phenomenon. 2. Miscarriage: before the 28th week of pregnancy, frequent contractions of the uterus, you will feel the stomach pains, frequent paroxysms can lead to vaginal bleeding, the mouth of the uterus is wide open, if you do not seek medical treatment in time, can lead to the delivery of the fetus. 3. Placental abruption: Placental abruption refers to the partial or total detachment of the placenta from the uterine wall in its normal position after 20 weeks of gestation or during labor and delivery of the fetus, which may be manifested by stomach pains. In addition, signs of labor and other symptoms may also appear, it is recommended that pregnant women should go to the obstetrics department of a regular hospital in time to take targeted treatment measures under the guidance of a professional doctor.