When pregnant women experience stomach pain at night, it may be related to ectopic pregnancy, pre-miscarriage or preterm labor, uterine contraction pain and other factors, or it may be related to pain in the abdominal organs. 1. Ectopic pregnancy: If one side of the stomach suddenly and persistently recurs in early pregnancy, accompanied by vaginal bleeding, it may be caused by ectopic pregnancy, and pregnant women need to consult a doctor in time for diagnosis and treatment. 2. Pre-eclampsia or preterm labor: paroxysmal stomach pain at night in early pregnancy accompanied by an obvious feeling of falling in the abdomen may be caused by pre-eclampsia; if stomach pain occurs in late pregnancy, accompanied by vaginal bleeding or discharge, it may be caused by preterm labor. 3. Contraction pain: contraction pain refers to the pain that will be induced when the contraction is stronger, which is caused by excessive muscle contraction or stronger contraction, and it usually occurs near the expected date of labor, so pregnant women who are pregnant and sleep at night with stomach pain may be caused by contraction pain. 4. Abdominal organ pain: abdominal organ pain may be caused by organ inflammation or stones, such as pancreatitis, hepatitis, cholecystitis, gallbladder stones, urinary stones, gastroenteritis, etc. Pregnant women sleeping at night with stomach pain may also be caused by such diseases. Clinical advice to pregnant women to timely medical examination, clear causes for targeted treatment, pay attention to rest in life, avoid strenuous exercise or engage in heavy physical labor, on time for maternity checkups and so on.