Fibroids are non-cancerous growths that develop in or on the uterus. They are made of muscle and fibrous tissue and can vary in size from very small to large masses. Many women experience no symptoms, but some may have heavy menstrual bleeding, pelvic pain, or pressure on the bladder. The exact cause of fibroids is not fully understood, but they are influenced by hormones, particularly estrogen and progesterone. Risk factors include family history, obesity, and certain dietary habits. Treatment options range from monitoring to medication and, in some cases, surgery to remove the fibroids.