Normally, the endometrium is located within the body of the uterus. When, for various reasons, endometrial tissue appears outside the body of the uterus, it is called endometriosis, or endometriosis for short. It can lead to consequences such as dysmenorrhea, lower abdominal pain, abnormal menstruation, discomfort during intercourse, infertility, and even cancer. About 25% of patients with endometriosis may be asymptomatic; some patients may only show symptoms such as lower abdominal pain associated with the menstrual cycle, dysmenorrhea, and in more pronounced cases, pain during menstruation; abnormal menstruation may also occur, such as increased menstrual flow, prolonged menstruation, incomplete menstrual dripping or premenstrual spotting, and deep intercourse pain. Endometriosis can also cause infertility. The infertility rate of endometriosis is as high as 40%, probably due to altered pelvic microenvironment affecting sperm-egg union and transport, abnormal immune function leading to abnormal ovarian function, which in turn leads to ovulation disorders and poor corpus luteum formation. In moderate to severe cases, adhesions around the ovaries and fallopian tubes may affect the transport of fertilized eggs, thus leading to infertility. Endometriosis can cause ovarian cancer. Although the chance of cancer is low, not more than 1%, the risk of cancer is relatively increased in patients with endometriosis if they have high-risk factors such as obesity, early menarche, late menopause, long-term dioxin exposure, and long-term Danazol use. In summary, the common consequences of endometriosis are progressive dysmenorrhea, lower abdominal pain, abnormal menstruation, etc., but if left untreated for a long time, it can also lead to infertility or even cancer.