Dry throat and drink water is useless may be caused by certain diseases, such as chronic laryngitis, dry syndrome, diabetes and so on. 1. chronic laryngitis: mostly by the mucous membrane, submucosal tissues and other chronic inflammation, there can be lymphoid follicular hyperplasia, recurrent episodes, there is a sense of dryness of the throat, drinking water may not be very useful, can be localized to use some of the containing medicines, commonly used drugs such as cediriodine tablets, lysozyme tablets, etc.. 2. Dry syndrome: it is a kind of chronic inflammatory autoimmune disease, mainly characterized by reduced secretion of salivary glands and lacrimal glands, with dry throat, need to drink water frequently when speaking or eating solid food, and often still feel dry and uncomfortable when drinking more water. 3. Diabetes: Most of the plasma osmosis caused by hyperglycemia is elevated, the occurrence of cellular dehydration, often need to drink more water, poor glycemic control, drinking water still feel dry throat. Therefore, the emergence of throat discomfort need to consult a doctor in a timely manner, a clear diagnosis and treatment.