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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.
What causes blood clots? Blood clots may form when either the flow of blood in a vein slows, damage to a vein occurs, or the blood is more clotable. Many factors can increase a personâs risk for developing a blood clot in a vein. Common risk factors for developing a blood clot include: Immobility: Hospitalization; Being paralyzed; Prolonged sitting