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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.
Blood viscosity. The thicker (or more âviscousâ) blood is, the harder the heart has to work to pump it around the body and consequently more pressure is created within the vessels. Blood can thicken for many reasons but the main ones are a lack of water and or a high glucose (blood sugar) concentration.ardiac output (known as âQâ) is a measure of the amount of blood that is pumped out of the heart in one minute. âQâ specifically refers to the amount of blood pumped out of the left ventricle as this is the ventricle that supplies blood to the muscles and organs of the body.