The soreness of the abdomen after pregnancy is clinically common for the following reasons: 1. With the enlargement of the uterus, the ligaments will become painful to pull, and clinically this situation will be fully relieved with proper rest. 2. Because of the lack of progesterone in the body, causing contraction of the smooth muscle of the uterus, it will also cause the soreness of the abdomen, and it is recommended that clinically, according to the results of laboratory tests, if necessary, progesterone should be given for treatment. 3, because during pregnancy sexual life is too frequent, too strenuous, or engaged in heavy physical labor may appear the situation of small abdominal swelling, it is recommended not to have sex in the first three months of pregnancy, and avoid heavy physical labor. If the symptoms of pre-miscarriage appear, go to the hospital for examination and give antifetal treatment.