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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.
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.