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Do Allergies Cause Dry Mouth?

Published in Allergies and Dry Mouth 2 mins read

Yes, allergies can cause dry mouth. This occurs primarily through two mechanisms:

1. Mouth Breathing Due to Nasal Congestion:

Allergic rhinitis (hay fever) often causes nasal congestion. When your nose is blocked, you are more likely to breathe through your mouth. This constant mouth breathing dries out the oral mucosa (the lining of your mouth), leading to dry mouth. Multiple sources confirm this mechanism. (Source 1, Source 2, Source 3, Source 4)

2. Side Effects of Antihistamines:

Many people use antihistamines to treat their allergy symptoms. A common side effect of these medications is dry mouth. Antihistamines work by blocking histamine, a substance involved in allergic reactions, but this action can also reduce saliva production, resulting in a dry mouth. (Source 1, Source 2, Source 5, Source 6)

It's important to note that while allergies can contribute to dry mouth, it’s not the only cause. Other factors such as certain medical conditions and medications can also lead to this symptom. Dry mouth resulting from allergies can increase the risk of dental problems like cavities and gum disease. (Source 1)