3. Dehydration

Lack of fluids can result in dehydration and thereby dry mouth. Dehydration causes thirst, low blood pressure, dry mucous membranes, and little or no urination. When the body senses it is becoming dehydrated, it may stop providing fluids for functions like saliva in order to retain as much as possible for more essential processes. Mild dehydration requires increased fluid intake, while more severe events may require hospitalization and IV treatment with fluid and electrolytes.

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