Search Uterine Leiomyomas Leiomyomas are also known as fibroids.
Fibroids are muscle tumors of the uterus that are very common in the general population.
They arise from a single smooth muscle cell that has lost the proper signaling to stop growing. Over time the muscle tumors get larger and may start to cause problems. Women may have more that one fibroid. Most of the fibroids are benign and cause no problems other than the problems caused by their location and size. Large fibroids have been implicated in pelvic pain, low back pain, increased abdominal size, irregular bleeding, increased menstrual discomfort, and infertility.