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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.
Thick blood is problematic if there are symptoms that are not being treated. Some people with hypercoagulability do not show signs or symptoms. When blood is thickening within the body, however, it has a difficult time circulating and carrying necessities, such as oxygen, nutrients and hormones throughout the body.