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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.
People with thick sticky blood have a much higher chance of strokes, heart attacks and high blood pressure. These problems may happen when you are still relatively young, say in your forties and fifties. This is a well-known fact and has led to the widespread use of daily aspirin to thin the blood.