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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.
If you have high blood pressure then this can result in chronic flushing in the face. High blood pressure can be caused by various things  such as cholesterol which is fatty deposits clogging our veins and arteries. This essentially thins the space available in the blood vessels thereby increasing blood pressure.