The womb, or uterus, is a bundle of muscles. For unknown reasons, a part of this muscle forms a ball called a fibroid. They can be as small as a pea or as large as a grapefruit.
Fibroids can be single or many.
They can be on the surface or in the middle of the muscle, or hang into the cavity of the uterus. These fibroids are not cancer, although they slowly tend to grow larger. At menopause they tend to shrink in size. It is estimated one out of three women over thirty years of age have fibroids. You may not know that you have fibroids because they often exist without any symptoms.