Fibroids are noncancerous (benign) growths that develop in the muscular wall of the uterus. While fibroids do not always cause symptoms, their size and location can lead to problems for some women, including pain and heavy bleeding.
Fibroids range greatly in size from very tiny (a quarter of an inch) too larger than a papaya (10 inches or more). In some cases, they can cause the uterus to grow to the size of a five-month pregnancy and the woman looks as though she is pregnant. In most cases, there is more than one fibroid in the uterus.