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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.
What causes blood clots? Blood clots may form when either the flow of blood in a vein slows, damage to a vein occurs, or the blood is more clotable. Many factors can increase a personâs risk for developing a blood clot in a vein. Common risk factors for developing a blood clot include: Immobility: Hospitalization; Being paralyzed; Prolonged sitting