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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.
Understand the Term. Thick blood is known in the medical community as hypercoagulability. As its name indicates, this condition causes blood to clot much more easily than usual because it is thicker and stickier. Normally, a combination of proteins within blood prevent it from clotting in the vessels.