The most common cause of stomach pain when your period comes is menstrual cramps. The body produces a special hormone, prostaglandins, during menstruation. Prostaglandins promote muscle contraction, so menstrual cramps, lower abdominal cramps and discomfort, accompanied by painful lumbosacral swelling can occur. The symptoms can be temporarily observed if they are mild. For patients with more severe symptoms that affect their daily life, it is recommended that prostaglandin drug inhibitors, such as the commonly used indomethacin and ibuprofen, can be used. If the patient does not require fertility in the near future, oral short-acting contraceptives can also be taken to treat dysmenorrhea. If the patient has no need to have children within a year, the same treatment can be considered by wearing the Manometra ring.