Diabetic patients can occur dry mouth, thirst and other symptoms, but dry mouth is not always diabetes, dry mouth in addition to diabetes, can also be seen in the following diseases: First, mental thirst, due to drinking too much water will lead to thirst symptoms worsening, the more you drink the more thirsty, mental thirst is a functional disease, active water restriction after the symptoms will gradually improve. Second, dry mouth can also occur in patients with dry syndrome, dry syndrome is a connective tissue disease, more dry mouth, dry eyes and other symptoms, can be accompanied by rampant teeth. Third, chronic pharyngolaryngitis can appear dry mouth, dry throat symptoms. Fourth, elderly patients when the salivary glands and other glands to reduce secretion, there can be a reduction in salivary secretion can also appear dry mouth, so if the patient appears dry mouth symptoms, need to further examination to clarify the cause.