Fibroids, also called as leiomyomas, are benign smooth muscle tumors that happen in the uterus. They grow under the influence of estrogen and progesterone, and are therefore seen in the reproductive years. By the age of 40, 40% of women have fibroids. African-American women may be prone to get symptomatic fibroids in their 20's. With menopause and the reduce in hormones, fibroids also reduces in size. The most common symptom from fibroids is abnormal bleeding. When fibroids grow, it can also cause pressure symptoms on the bladder, rectum or pelvis. There may be a genetic predisposition to having fibroids and lot of fibroids.