Uterine polyps are soft red outgrowths from the lining of the womb (the endometrium), usually less than 1 cm in diameter, which often flatten to fit the cavity of the uterus.
The stalk of the polyp (or pedicle) is usually short, but sometimes it grows long enough for the polyp to project from the cervix (the lower opening of the womb). Polyps are prone to bleeding, and a uterine polyp that develops near the fallopian tubes may obstruct the opening of the tubes, possibly leading to difficulty with becoming pregnant. Uterine polyps can develop in pre- or post-menopausal women. Very rarely, polyps can be cancerous.