Frequent salivation during sleep could be a sign of one of these 6 diseases.

Drooling during sleep is common, especially in children and in certain sleeping positions. However, if it occurs   frequently, suddenly, or in large amounts in adults  , it could be a sign of an underlying health problem.

Occasional drooling is normal, but persistent drooling – especially when accompanied by other symptoms – should not be ignored. Here's what you need to know.

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