Abdominal pain is a normal phenomenon for some pregnant women, while others are caused by miscarriage, ectopic pregnancy, acute gastroenteritis or other diseases. 1. Normal phenomenon: for pregnant women, due to the increasing size of the uterus, the uterine ligaments are pulled and abdominal pain phenomenon, not accompanied by other symptoms, without special treatment. 2. Pre-eclampsia: Pre-eclampsia is related to chromosomal abnormalities of the embryo and systemic diseases of the mother. Pre-eclampsia occurs before the 28th week of pregnancy, pregnant women will have vaginal bleeding, lower abdominal pain and other symptoms, so it can be manifested as abdominal pain. 3. Ectopic pregnancy: Ectopic pregnancy refers to the development of fertilized egg in the uterus outside the body cavity, typical manifestations of menopause, abdominal pain, vaginal bleeding and so on. Therefore, some pregnant women with ectopic pregnancy may have abdominal pain. 4. Acute gastroenteritis: acute gastroenteritis and pathogenic microbial infections, improper diet, etc., the disease will cause pregnant women with abdominal pain, diarrhea, nausea and vomiting and other symptoms, can also be manifested as abdominal pain. 5. Other diseases: cholecystitis, pancreatitis, acute gastric torsion, gastritis, irritable bowel syndrome, urinary tract infections. It is recommended that pregnant women with abdominal pain consult a doctor for an examination to determine the cause of the illness and then follow the doctor’s instructions for treatment, and not unauthorized use of medication.