There are many reasons for stomach pain after menstruation, menstrual blood is discharged from the body, weak people are prone to iron deficiency anemia, the uterus is not able to return to its original state in the short term, the uterus contraction ability to enhance the phenomenon of postmenstrual dysmenorrhea will continue for a period of time. Secondly, it is mainly due to inflammation caused by the common pelvic fluid, pelvic inflammatory disease, will also make a large amount of secretions stored in the female pelvis, so it is easy to appear the phenomenon of lower abdominal pain. Both of these conditions can be treated with hot compresses and physical instruments. For patients with more serious abdominal pain, they should further go to the hospital for gynecological ultrasound examination to understand the severity of the condition, and medication can be taken.