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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.
Close-up of an assortment of vitamins. Photo Credit manu10319/iStock/Getty Images. Your body maintains a delicate balance with your blood to ensure you have enough blood and that it is not too thick or too thin. Over time, excess cholesterol or clotting factors in your blood can make your blood thicker and more likely to clot -- an occurrence that can lead to a heart attack or stroke. While your physician may prescribe medications to thin the blood, certain vitamins also have been shown to have blood-thinning effects.