Pregnancy stomach pain can be caused by physiological factors, pre-miscarriage, gastrointestinal diseases, pelvic inflammatory disease, preterm labor and other factors. 1. Physiological factors: after pregnancy, the uterus enlarges or false contractions, which may lead to stomach distension and pain, only slight distension and pain, no other abnormal symptoms, reasonable rest can be improved on their own, do not need to carry out special treatment. 2. Pre-eclampsia: In the early stage of pregnancy, insufficient progesterone in the body may cause pre-eclampsia, which may also result in bloating and pain in the stomach, accompanied by lumbosacral distension, vaginal bleeding and other symptoms. 3. Gastrointestinal diseases: After pregnancy, due to the weakening of gastrointestinal digestion and absorption ability, improper diet may lead to gastrointestinal dysfunction or indigestion, which may cause stomach bloating and pain, and may be accompanied by nausea and vomiting and other symptoms. 4. Pelvic inflammatory disease: After pregnancy, due to low immunity and improper care, pelvic inflammatory disease may be induced, and the aggravation of the infection will lead to bloating and pain in the stomach, which may be accompanied by smelly secretions, fatigue, lumbar pain and other symptoms. 5. Pre-eclampsia: Pre-eclampsia may occur in late pregnancy, manifesting itself as irregular swelling and pain in the lower abdomen, often accompanied by redness. If the bloating pain lasts for a long time and is accompanied by other abnormalities, it is recommended to seek medical examination and treatment as soon as possible to avoid adverse effects.