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Thick blood may also be caused by the presence of harmful pathogens such as fungi, viruses, bacteria, and parasites. These pathogens can actually activate a coagulation response in the body as a way to avoid being attacked by the bodyâs immune system.
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.