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The extra red blood cells make your blood thicker than normal. As a result, blood clots can form more easily. These clots can block blood flow through your arteries and veins, which can cause a heart attack or stroke. Thicker blood also doesn't flow as quickly to your body as normal blood.
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.