The phenomenon of stomach distension in the first month of pregnancy is divided into physiological and pathological. In the early stages of pregnancy, the influence of hormonal secretion in the body leads to muscle and ligament relaxation and compression of the pelvic cavity, which can cause stomach distension and pain, which is a physiological manifestation and does not require special treatment. Pathological, due to gynecological inflammatory infections, pelvic inflammatory disease, endometritis or tubal inflammation and other diseases, will cause stomach distension and pain. When there are signs of miscarriage, there will be stomach distension and pain, and also show the phenomenon of vaginal bleeding, you need to pay attention to ultrasound examination, pay attention to the distinction, take symptomatic treatment measures to avoid serious development of the disease, resulting in increased chances of miscarriage.