Hundreds of prescription and over-the-counter medications can reduce saliva production.
Common examples include:
- Allergy medications (antihistamines)
- Antidepressants
- Anxiety medications
- Certain blood pressure medicines
- Bladder medications
- Muscle relaxants
- Some pain medications
If dry mouth began after starting a new medication, don’t stop taking it on your own. Instead, speak with your healthcare provider or pharmacist to discuss possible alternatives.
4. Acid Reflux (GERD)
Many people don’t realize that nighttime acid reflux can contribute to dry mouth.
When stomach acid repeatedly reaches the throat during sleep, it can irritate tissues and encourage mouth breathing.
Other clues include:
- Frequent heartburn
- Sour taste in the mouth
- Chronic cough
- Hoarseness
- Burning throat after waking
Managing reflux often improves nighttime comfort.
5. Diabetes
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Persistent dry mouth may sometimes be linked to elevated blood sugar.
High glucose levels can increase urination, leading to dehydration and reduced saliva production.
Other symptoms may include:
- Increased thirst
- Frequent urination
- Blurred vision
- Fatigue
- Slow-healing wounds
Dry mouth alone doesn’t diagnose diabetes, but when combined with these symptoms, it’s worth discussing with your healthcare provider.
6. Dehydration
Sometimes the explanation is surprisingly simple.
Not drinking enough fluids during the day—or losing fluids through heavy exercise, hot weather, vomiting, diarrhea, or fever—can leave your body dehydrated by bedtime.
Signs of dehydration include:
- Dark-colored urine
- Headaches
- Fatigue
- Dizziness
- Dry lips and skin
Staying well hydrated throughout the day is often more effective than drinking large amounts of water right before bed.
