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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.
I certainly believe dehydration as a cause of the thickening of the blood is one of the contributing factors (to DVT), noted Dr. Bo Eklof, clinical professor of surgery at the University of Hawaii, who recently attended a World Health Organization conference in Geneva on the issue.