Polyps are small growths in the body. They can look like small mushrooms or flat bumps. Uterine polyps grow in the inner lining of the uterus in women. They are also called endometrial polyps. You may have one polyp or several. Uterine polyps can range in size from just a few millimeters to more than 6 centimeters (2.4 inches) wide. More than 95 percent of uterine polyps are benign, meaning they don’t cause cancer