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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 your results mean Clotting too slowly. Blood that clots too slowly can be caused by: Blood-thinning medications ; Liver problems; Inadequate levels of proteins that cause blood to clot; Vitamin K deficiency; Other substances in your blood that hinder the work of clotting factors; Clotting too fast. Blood that clots too quickly can be caused by: