Women may have different degrees of pregnancy reactions after pregnancy, if the occurrence of hidden pain in the abdomen, may belong to the physiological pain caused by the process of fetal development, may also be pathological phenomenon of pre-eclampsia or ectopic pregnancy, according to the degree of pain and time, usually can include the following conditions: 1, physiological abdominal pain: early pregnancy, the embryo bed process affected by hormone secretion, may appear lower abdomen The pain is generally physiological, mild and of short duration. In addition, the pain can be caused by the enlargement of the uterus and the pulling of the uterine ligaments in the middle and late stages of pregnancy. If the pain is not accompanied by other uncomfortable symptoms, no special treatment is usually needed. Attention should be paid to rest, avoid overexertion, and change the sleeping position, such as adopting a side-lying position to gradually relieve the pain. 2. Pathological abdominal pain: If the abdominal pain is paroxysmal with low back pain, lasts for a long time and cannot be relieved after rest, or even accompanied by vaginal bleeding, it may belong to preterm abortion. In addition, when the ectopic pregnancy has not ruptured, it often shows vague pain or distension in the lower abdomen, and when it ruptures, it suddenly feels severe pain like tearing in the lower abdomen on the affected side. The above-mentioned cases need to be treated under the guidance of professional doctors after promptly going to the hospital for ultrasound examination to clarify the cause. In addition to pregnancy, pregnant women who suffer from gastrointestinal diseases (gastritis, enteritis, peptic ulcer), gynecological diseases (pelvic inflammatory disease, adnexitis) or bad food during pregnancy may cause vague pain in the abdomen, accompanied by diarrhea, vaginal bleeding, odorous discharge and other symptoms.