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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.
Thick blood (also known as hypercoagulability, Antiphospholipids, and Hughes Syndrome) is a condition where the blood is more viscous (thicker and stickier) than normal. The unusual increase in the thickness of blood is due to an abnormality in the clotting process.