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Thick blood is caused by a variety of conditions, such as heavy proteins in the blood, too much blood in circulation or a blood clot system imbalance, according to Southeastern Medical Oncology Center. Diseases such as cancer and lupus can also lead to thick blood. Continue Reading.
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.