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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.
The thickness of your blood can depend on a number of factors. Your red blood cell count has the most influence on the viscosity of your blood. Blood fats, such as LDL (âbadâ) cholesterol, can affect this viscosity â the more LDL you have passing through your bloodstream, the thicker your blood will be. Other factors such as chronic inflammation, smoking, diabetes, eating habits and even your genetic makeup can all contribute to the varying thinness or thickness of your blood.