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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.
Lifestyle factors such as smoking can also contribute to the formation of thick blood, and this change in blood viscosity can lead to an increased risk of dangerous clots. Thick blood is often easily identifiable with a blood coagulation test and, there are now home options available in order to test how thick or thin the blood is. In turn, the use of home kits to test blood thickness can also be essential to determining how to prevent blood clots.