Facts Many women will develop fibroids at some point during their childbearing years with estimates varying from 30 to 77% of women. Only 1/3 of fibroids are large enough to be detected during a gynaecological examination. Majority of women experience fibroids before they turn 50. 70% of women with fibroids experience no symptoms. 99% of fibroids are benign. Symptoms Heavy menstrual bleeding Painful periods Abdominal pain or lower back pain Pain during sex Urinating frequently