If you have menstrual pain, you need to find out the cause and determine whether it is primary or secondary dysmenorrhea. 1. Primary dysmenorrhea is mainly due to the endometrium shedding which secretes a lot of prostaglandins and causes contraction of the smooth muscle of the uterus during menstruation, so there is pain in the stomach. This is because of the fact that the company’s products and services are not only available in the market, but also in the market. 2. secondary dysmenorrhea, which is secondary to a disease, such as inflammation of the pelvis, endometriosis, and malformation of the uterus. In addition, there are tumors in the pelvis that can also cause dysmenorrhea. Therefore, it is recommended to have a detailed gynecological examination to understand the causes of dysmenorrhea and give targeted treatment to achieve the ideal treatment effect.