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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.
Thick blood is problematic if there are symptoms that are not being treated. Some people with hypercoagulability do not show signs or symptoms. When blood is thickening within the body, however, it has a difficult time circulating and carrying necessities, such as oxygen, nutrients and hormones throughout the body.