When you have your period, you may be experiencing dysmenorrhea. The primary dysmenorrhea is the dysmenorrhea that occurs at the beginning of menstruation, mainly when the lower abdomen hurts without menstruation, and some women have heavy dysmenorrhea that needs to be treated with painkillers. This is due to the fact that women secrete more prostaglandins when they have their periods, which stimulates the body to produce painful sensations. In case of secondary dysmenorrhea, most of the time endometriosis occurs, such as adenomyosis or ovarian chocolate cysts. Endometriosis is a condition in which the endometrium of the uterus grows ectopically and is planted outside the uterine cavity.