Swelling and pain in the small stomach during menstruation can be clinically due to the following reasons. The first is pain caused by uterine contractions, which tend to be paroxysmal. When the pain with the hand to feel the lower abdomen, will feel the uterus is relatively hard, this is the contraction caused by the pain. This is the pain caused by contraction. Oral motherwort capsules can be taken to relieve pain. The second is because of infection, resulting in pelvic inflammation, so there will be lower abdominal pain, often accompanied by increased vaginal discharge, and there will be a strange odor of the discharge. In addition, some people also have fever, it is recommended to actively give anti-inflammatory treatment, and to keep the vulva clean, to avoid aggravating the inflammatory reaction. During the monthly period, the body resistance is decreased, so we must pay attention to personal hygiene, so as to reduce the occurrence of inflammation.