- Subserosal: these develop on the outside wall of the uterus, and typically do not affect menstrual flow, but can cause pelvic and back pain.
- Intramural: these are the most common fibroids, and grow from the lining of the uterus, growing inward and increasing its size. They generally lead to heavier menstrual bleeding, pelvic and back pain
- Submucosal: these are the least common fibroids, and by far the most problematic. They are located inside the uterus and may protrude into the uterus Even the smallest ones can cause very heavy bleeding and prolonged periods.