Endometriosis is a common yet often misunderstood condition that affects millions of women. It occurs when tissue similar to the lining of the uterus grows outside the uterus, leading to pain, heavy periods, and other complications. If you or someone you know has been diagnosed with endometriosis, understanding the condition, its symptoms, and available treatments can help in managing it effectively. What Are the First Signs of Endometriosis? The symptoms of endometriosis var