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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.
However, although alcohol can increase the chances of thread veins, experts say they can also be caused by too much sun, smoking, or by rosacea, a skin condition which causes a red nose and face. 1  Soaring numbers of men are having unsightly thread veins - caused by drinking, smoking and sun exposure - removed.