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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.
A blood clot forming in the arteries of the heart can result in a heart attack. Blood clots cause problems in the affected organ by cutting off oxygen flow. Thick blood is caused by heavy proteins, or by too much blood in the circulation.Too many red cells, white cells, and platelets will result in blood thickening.Another cause is an imbalance in the blood clotting system.hick blood is caused by heavy proteins, or by too much blood in the circulation. Too many red cells, white cells, and platelets will result in blood thickening. Another cause is an imbalance in the blood clotting system.