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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.
Because warfarin interferes with the formation of blood clots, it is called an anticoagulant. Many people refer to anticoagulants as âblood thinnersâ; however, warfarin does not thin the blood but instead causes the blood to take longer to form a clot.