The causes of stomach pain before menstruation are as follows: 1. It may be due to lower hormone levels, poor pelvic blood circulation will lead to anal pain or the presence of endometriosis, tighter cervical opening, etc. Pre-menstrual stomach pain may also occur. 2. If a woman is stimulated by cold or eats colder food before menstruation, stomach pain may also occur. Therefore, women who have stomach pain before menstruation should pay attention to proper rest, drink more brown sugar water to relieve it, and also take oral blood flow capsule, motherwort granules, etc. to promote blood circulation in the pelvis or give painkillers such as ibuprofen for relief. More severe stomach pain before menstruation can easily lead to menstrual disorders and be detrimental to health.