Dry mouth (xerostomia)
One of the most common symptoms of both type 1 and type 2 diabetes is dry mouth, and it can be a consequence of the effects of high sugar levels in the blood. High blood sugar levels cause frequent urination, as kidneys create more urine to eliminate the excess of sugar. As a consequence of the increased urination, the body loses fluid and becomes dehydrated. If you don’t drink enough water to replenish the loss of fluids, your mouth becomes dry.