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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 thickened blood hinders the circulation of oxygen, nutrients, and hormones and prevents them from being transferred successfully to tissues and cells throughout the body. This may result in widespread nutritional and hormonal deficiencies as well as Hypoxia, a condition in which cells have a low level of oxygen.