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Thick blood may also be caused by the presence of harmful pathogens such as fungi, viruses, bacteria, and parasites. These pathogens can actually activate a coagulation response in the body as a way to avoid being attacked by the bodyâs immune system.
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.