Dry mouth could indicate diabetes, but not as a stand-alone symptom, according to Mayo Clinic. Other symptoms that are usually present include frequent urination, weight loss, blurred vision and slow healing of sores and wounds.
The most common cause of dry mouth is dehydration, says WebMD. Dry mouth can also be a side effect of certain medications, some of which include drugs used to treat pain, anxiety, allergies, nausea, depression and hypertension. Chemotherapy and radiation often cause dry mouth. Another cause of dry mouth is nerve damage to the neck and head area after surgery or injury. Infections and diseases, such as diabetes, hypertension, anemia, mumps, HIV/AIDS, Alzheimer's disease, Parkinson's disease and Sjögren's syndrome, cause dry mouth, but other symptoms are also present, according to WebMD.