Fibroids are benign lumps of muscle and connective tissue that grow on the wall of the uterus under the influence of hormones.
They are very common, affecting nearly one in four women over 35, and can vary in number and size.
Symptoms of larger fibroids include swelling, heavy or abnormal periods, pain during intercourse, urinary problems, and backache.
Treatment depends on the severity of the problem and may involve an ultrasound scan, hysteroscopy, or removal of small fibroids.
Many women are unaware they have fibroids because they cause no problems at all.
Fibroids usually shrink after menopause when hormone levels drop.
Author's summary: Fibroids are common and affect many women over 35.