Endometrial polyps are growths that form on the inner wall of the uterus. They are made up of endometrial tissue, which is the same tissue that lines the uterus and helps to shed during menstruation. Endometrial polyps are usually noncancerous, but can sometimes be associated with cancer. They can range in size from a few millimeters to several centimeters, and can be solitary or multiple. The exact cause of endometrial polyps is unknown, but is believed to be related to hormonal imbalances, endometrial cell overgrowth, and chronic inflammation. Polyps can cause symptoms such as abnormal bleeding, pelvic pain and infertility. Diagnosis is usually made through a pelvic exam, ultrasound, and/or a hysteroscopy. A hysteroscopy is a procedure that allows the doctor to look directly inside the uterus. Treatment for endometrial polyps typically involves removing the polyps. This can be done through medication, such as progestin or gonadotropin-releasing hormone agonists, or through a surgical procedure. It is important to have endometrial polyps monitored by a doctor and treated if necessary. If left untreated, they can cause infertility or lead to cancer.