Fibroids
Fibroids, or myomas, are growths or benign tumours that form inside the uterus (womb). Around four in 10 women over the age of 40 will have fibroids. No one knows why fibroids develop, but it is suspected that the sex hormones - oestrogen and progesterone - play significant roles. This is because fibroids rarely grow in prepubescent girls and postmenopausal women. Pre-existing fibroids stop growing, and may even shrink, once a woman passes the menopause.
Fibroids often cause no problems, but may occasionally be associated with infertility, miscarriage and premature labour. Other possible problems include heavy, lengthy and painful periods.
Treatment depends on the size, number and location of the fibroids, but may include drugs and surgery. Fibroids rarely turn cancerous.