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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.
This is because they can dry out the oral cavity, causing saliva to become thick. Ensure you drink enough water if your medication lists dry mouth as a side effect. Diabetes and elevated blood sugar: When blood sugar level gets high or uncontrolled, it leads to dry mouth, once again causing thick saliva.