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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.
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.