Endometriosis is a common female gynecological condition in which endometrial cells are planted in abnormal locations. Endometrial cells are supposed to grow in the uterine cavity, but since the uterine cavity is connected to the pelvic cavity through the fallopian tubes, this allows the endometrial cells to grow ectopically via the fallopian tubes into the pelvic cavity. So, what are the causes of endometriosis? 1. Planting theory During menstruation, menstrual blood is discharged from the uterus and vagina downstream, but a small portion of the menstrual blood or for other reasons is mixed with shed endometrial debris, which flows from the fallopian tube into the abdominal cavity and is planted in the surface layer of the pelvic organs to form endometriosis lesions. 2.Chemical endometrium During the period of embryonic development of human body, the surface epithelium of ovary, peritoneum, vaginal rectal diaphragm and umbilicus are derived from the epithelium of body cavity. These tissues can be transformed under the stimulation of gonadal hormones, inflammation and mechanical factors to form another kind of tissue, which can also be transformed into endometrium. 3. Benign metastasis This is a relatively rare cause of morbidity. Appearing in the lungs, meninges, pericardium, extremities and other distal endometriosis, it develops by transferring endometrial debris to rest on an organ or tissue through the blood circulation or lymphatic system. 4.Medical endometrial transplantation This is an artificially caused transplantation of endometrium to certain parts of the uterus, mostly seen during cesarean section, early and mid-term pregnancy scraping, perineal lateralization during delivery, abortion, etc. 5. Defective immune defense function The endometrium that flows back to the abdominal cavity with menstrual blood is like a foreign body that activates the immune system in the body and mobilizes a large number of immune cells and body fluids to surround and eliminate it, and if the immune function in the body is defective, it will develop into endometriosis. 6, endocrine dysfunction Ectopic endometrium, regardless of the source, its growth changes are related to ovarian endocrine, estrogen can promote growth, progesterone can make it inhibit, the clinical findings of most patients, progesterone deficiency, and therefore contribute to the development of the disease. 7, genetic and physical factors Clinical observation shows that most people with a family history of the disease suffer from this disease. Physical factors such as obesity, overweight, excessive length, etc. also have a certain relationship. Tips: If women are troubled by this, they should go to the hospital for examination and treatment in time. In addition, endometriosis has a very high recurrence rate and should be managed as a chronic disease like hypertension and diabetes to guide long-term treatment and avoid reoperation.