The term endometriosis refers to the presence of glands as well as mesenchyme of the endometrium, which has a normal function, in a place other than the uterine cavity. Depending on where it occurs, there are two main forms of manifestation: the first is ovarian chocolate cysts: the second is adenomyosis. Ovarian chocolate cysts are harmful to the body in the following three ways: the first is dysmenorrhea, the second is pelvic mass, and the third can cause infertility. First, dysmenorrhea. The dysmenorrhea caused by ovarian chocolate cysts is very serious and even affects normal life. In the pre-menstrual period, there will be lower abdominal swelling and discomfort, which lasts throughout the menstrual period, and some even non-menstrual period will have lower abdominal pain and discomfort, especially during coitus or gynecological examination, which can be obviously felt during the tenderness. Secondly, pelvic mass. Ovarian chocolate cysts with the prolongation of time, the pelvic cavity will appear chocolate-like fluid, coupled with the wrapping of the surrounding tissues, thus forming a mass, the mass is larger than 4cm, or accompanied by the elevation of ovarian tumor markers, there are indications for surgical exploration. Finally, infertility. Due to the adhesion of the ovarian chocolate cyst tissue and the erosion of the surrounding tissues, it will lead to the non-communication of the fallopian tube or the communication but not smooth, thus affecting the pregnancy.