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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.
Â· just now. Report Abuse. Too many red blood cells can make the blood thick and sticky causing problems with the circulation in the small blood vessels. Treatment is usually blood thinning medication or treatment of the cause if it can be found. huggz Â· 9 years ago. Thumbs up. 0. Thumbs down. 0. Comment. Add a comment. Submit.