CBS.com; CBS All Access; CBS News; CBSN; Watching Live TV. All Access Live TV; TV Provider
The extra red blood cells make your blood thicker than normal. As a result, blood clots can form more easily. These clots can block blood flow through your arteries and veins, which can cause a heart attack or stroke. Thicker blood also doesn't flow as quickly to your body as normal blood.
While submucosal and intramural fibroids are commonly to blame for causing heavy bleeding, other types of fibroids may also cause excessive blood loss. By their nature, fibroid tumors require a heavy blood supply to grow. This causes blood vessels to expand with the increased need by fibroids for blood.