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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.
Clog vessels: Way too thick, like with sickle cell disease, some cancer states or severe dehydration, can increase viscosity of blood so much that it clogs up smaller vessels--this stops blood flow beyond--can cause tissue to die, like a heart attack or stroke. ...Read more.