The exact cause of
uterine fibroids is not known. Fibroids begin when
cells overgrow in the muscular wall of the uterus.
After a fibroid
develops, the hormones
progesterone appear to influence its growth. A woman's
body produces the highest levels of these hormones during her childbearing
menopause, when hormone levels decline, fibroids
usually shrink or disappear.
Uterine fibroids (leiomyomata) are non-cancerous growths that develop in or just outside a woman’s uterus (womb). Uterine fibroids develop from normal uterus muscle cells that start growing abnormally. As the cells grow, they form a benign tumor.