Throat is always dry always feel dehydrated, may be too little water, dry syndrome, diabetes, chronic pharyngitis, reflux esophagitis and other reasons. 1. Drinking too little water: long-term lack of drinking water, long time in the hot and high temperature environment, lack of air circulation, frequent open-mouth breathing and other factors lead to the lack of water in the throat, so the above symptoms will appear. 2. Dry Syndrome: Antibodies are produced after autoimmune system disorder, which mistakenly attack the salivary glands, lacrimal glands and other glandular tissues, leading to a decrease in the synthetic secretion of saliva and so on, so the above symptoms will appear. 3. Diabetes mellitus: after the blood glucose level is higher than the renal glucose threshold, a large amount of glucose enters into the urine, leading to an increase in urinary osmolality, osmotic diuresis, and the loss of water in the body, resulting in the above symptoms. 4. Chronic pharyngitis: long-term repeated infections of the mucous membrane of the pharynx lead to proliferation of local fibrous tissue and lymphatic tissue, resulting in symptoms such as foreign body sensation and dryness in the throat. 5. Reflux esophagitis: stomach acid and other gastric contents in the lower esophageal sphincter dysfunction through the esophagus reflux into the throat, corrosion and stimulation of the local mucous membrane, resulting in the emergence of the above symptoms. Throat always dry always feel dehydrated may be related to a variety of factors, it is recommended to consult a doctor for a clear diagnosis.