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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.
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.