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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.
Causes of a Thickened Vessel. Aneurysm. An aneurysm is the bulging of a portion of a blood vessel. It is an abnormal dilatation, like a balloon, and may affect an intact vessel wall (true aneurysm) or diseased wall (false aneurysm).It is not an actual thickening of the blood vessel wall but is rather a protrusion of the wall. Dissection.