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Thick blood is caused by a variety of conditions, such as heavy proteins in the blood, too much blood in circulation or a blood clot system imbalance, according to Southeastern Medical Oncology Center. Diseases such as cancer and lupus can also lead to thick blood. Continue Reading.
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.