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Physical Concerns. Dry mouth is a red flag for other physical problems. For instance if an individual is diabetic and the disease is being poorly managed this can cause dry mouth during the night or dry mouth can be a sign that the individual has diabetes.
Dry mouth is caused when the salivary glands in the mouth don't make enough saliva to keep your mouth wet. These glands may not work properly as the result of: Medications. Hundreds of medications, including many over-the-counter drugs, produce dry mouth as a side effect. Among the more likely types to cause problems are some of the drugs used to treat depression, high blood pressure and anxiety, as well as some antihistamines, decongestants, muscle relaxants and pain medications.