Thirst

Thirst. The sensation of thirst is usually referred to the back of the throat, but is caused by a general condition of the body, resulting from lack of fluid. This is shown by the fact that moistening the fauces is only of temporary benefit in relieving thirst, while the injection of fluid into the blood-vessels, or its absorption from the skin or mucous membrane of the alimentary canal, permanently relieves the condition. Excessive thirst is a characteristic symptom in certain diseases, of which diabetes may be especially referred to.