If there is pain in the stomach during pregnancy without vaginal bleeding, the most common causes are as follows: the first one is the contraction of the smooth muscle of the uterus caused by the lack of progesterone, which can lead to pain in the stomach. Although there is no vaginal bleeding, it is recommended that this condition be supplemented with progesterone in time to clinically relieve the pain in the lower abdomen, and bed rest is also recommended at the same time. Secondly, because of chronic pelvic inflammatory disease before pregnancy, the body’s resistance decreases after pregnancy, plus the pelvic cavity is in a state of congestion after pregnancy, which aggravates the original inflammatory pelvic tissue congestion, so the situation of lower abdominal pain can occur. It is recommended to combine clinical history and give anti-inflammatory treatment if necessary. Therefore, a comprehensive analysis is necessary to give a preliminary diagnosis before giving clinical treatment for the pain in the lower abdomen that occurs during pregnancy.