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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.
In rare cases, your body may begin to produce too much IgM. When this happens, your blood will become thicker (a symptom known as âhyperviscosityâ), making it difficult for all of your organs and tissues to function properly. This condition is known as WaldenstroemâwaldenstrÃ¶m s. disease