Endometriosis is a medical condition in which tissue that normally lines the inside of the uterus, known as the endometrium, grows outside of this organ. This condition usually affects the pelvic organs, such as the ovaries, fallopian tubes, peritoneum, and tissue lining the pelvis. Symptoms of endometriosis can include severe menstrual pain, chronic pelvic pain, pain during sexual intercourse, and fertility problems. It is a chronic disease that affects millions of women worldwide and can have a significant impact on their quality of life.