Benign uterine fibroids are the most common types of tumor in a woman?s pelvis. According to the American College of Obstetricians and Gynecologists (ACOG), these fibroids occur in approximately 25% to 50% of all women, with the highest incidence reported in women aged 30 to 40 years. Most fibroids are so small and asymptomatic that women are unaware of their presence. Even large fibroids may not cause bothersome symptoms, although they commonly are found in women who have menorrhagia (heavy periods), frequent urination, pelvic pain, back pain, infertility, and/or pregnancy loss.