Uterine Fibroids, Uterine Fibroids Causes, Causes of Uterine Fibroids Uterine fibroids, also known as Leiomyoma or just myoma for short, are non-cancerous growths made up of connective tissue and muscle that develop inside the uterus. Fibroids can be as small as a pin head or as big as a melon. #uterine_fibroids #uterine_fibroids_causes #causes_of_uterine_fibroids