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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.
Because warfarin interferes with the formation of blood clots, it is called an anticoagulant. Many people refer to anticoagulants as âblood thinnersâ; however, warfarin does not thin the blood but instead causes the blood to take longer to form a clot.