The following points can be observed to determine whether there is endometriosis: 1. Dysmenorrhea and lower abdominal pain, which usually starts 1-2 days before menstruation and disappears after menstruation. The symptoms of this dysmenorrhea gradually worsen, and the pain starts from the lumbosacral area and abdomen and gradually expands to the perineum, vagina, anus, thighs, etc. The patient is more painful. 2. menstrual disorders, some patients have symptoms of increased menstrual flow, prolonged periods, or spotting bleeding. 3. infertility, the most common symptom of endometriosis. 4. pain during intercourse, caused by mechanical stimulation during intercourse. 5. intestinal symptoms If the endometriosis is located near the rectum, anal swelling and difficulty in defecation will easily occur when menstruating. 6. Urinary tract symptoms, if the lesion is located near the bladder and ureter, frequent urination, painful urination and hematuria will occur when menstruating.