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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.
Â· just now. Report Abuse. Too many red blood cells can make the blood thick and sticky causing problems with the circulation in the small blood vessels. Treatment is usually blood thinning medication or treatment of the cause if it can be found. huggz Â· 9 years ago. Thumbs up. 0. Thumbs down. 0. Comment. Add a comment. Submit.