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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.
Thick Blood: Overview, Symptoms, Causes, Natural Treatments, and Medicine. Thick blood (also known as hypercoagulability, Antiphospholipids, and Hughes Syndrome) is a condition where the blood is more viscous (thicker and stickier) than normal. The unusual increase in the thickness of blood is due to an abnormality in the clotting process.