Pregnancy can cause stomach pain, and depending on the time of pregnancy, the performance of the pain caused and the reasons are different. The details are as follows: 1. Early pregnancy: early pregnancy reactions can occur during this period, and some pregnant women will have symptoms such as stomach pain and vomiting, thus manifesting as abdominal pain. If ectopic pregnancy is diagnosed, the rupture of tubal pregnancy or miscarriage may cause unilateral paroxysmal or tear-like pain in the small abdomen. In addition, if there is pre-eclampsia, it can also be manifested as pain in the lower abdomen or a significant feeling of falling in the abdomen, which can be accompanied by vaginal bleeding; 2. Mid-pregnancy: At this time, the fetus grows larger, resulting in the pulling of the round ligament of the uterus, which can cause abdominal pain. In addition, some pregnant women, due to the growth of the fetus, lead to a long-term increase in abdominal pressure, resulting in esophageal hiatal hernia, which can be accompanied by belching and a feeling of fullness in the upper abdomen; 3. Late pregnancy: if there are pseudo contractions, they can be manifested as irregular, short and weak uterine contractions. Or placental abruption due to gestational hypertension, trauma, smoking and other factors, may also manifest as persistent lumbar abdominal pain with vaginal bleeding, nausea, vomiting, etc. In addition to pregnancy causes, gastroenteritis, intestinal obstruction, and acute appendicitis can cause abdominal pain. If a pregnant woman has abdominal pain during pregnancy, she should seek medical attention for differential diagnosis and should not blindly treat herself to avoid accidents.