CBS.com; CBS All Access; CBS News; CBSN; Watching Live TV. All Access Live TV; TV Provider
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.
This makes the blood vessels narrower and makes it more difficult for blood to get through. Your blood pressure could go up. The buildup can also cause a blood clot to form. If a blood clot breaks off and travels to your heart, it causes a heart attack.