The clinical symptoms often vary depending on the site of the lesion and mainly manifest as periodic attacks. The number of asymptomatic cases is about 20%. Dysmenorrhea is a typical symptom of endometriosis and is characterized by secondary, progressive dysmenorrhea. It mostly occurs before and during menstruation, mostly 1 to 2 days before menstruation, and is most pronounced on the first day of menstruation, with the pain easing or disappearing after menstruation. The pain is mostly located in the lower abdomen and lumbosacral region, and may radiate to the vagina, perineum and anus. Some patients have painful intercourse and anal swelling, especially during menstruation. Menstrual disorders Increased menstrual flow, prolonged periods or menstrual disorders. If the endometriosis cyst ruptures, acute abdominal pain may occur, mostly during menstruation, and may be accompanied by nausea, vomiting and anal swelling. The infertility rate of patients with endometriosis is more than 60%. Intestinal or urinary tract symptoms When the ectopic lesion involves the rectum, sigmoid colon, bladder and ureter, symptoms such as difficulty in defecation, diarrhea, constipation, or even periodic blood in the stool, urinary frequency, urinary urgency and hematuria may occur.