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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.
sudden unexplained bruising or blood spots under the skin or a sudden increase in the frequency of bruising may be caused by a medicine such as aspirin or blood thinners anticoagulants infection that causes the buildup of toxin in the blood or tissues sepsis a bleeding or clotting disorder such as hemophilia von willebrand s disease thrombocytopenia or another less common bleeding or clotting disorder