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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.
Blood Thickness. Blood Can Be Too Thin or Too Thick. Blood that is too thick can lead to blood clots, and blood that is too thin can lead to easy bruising or bleeding. Problems with blood thickness can occur from birth, or develop later in life. Blood thickness may be affected by foods, drugs, and various medical conditions.