Thirst is a subjective feeling of lack of water in the body. Thirst is explained by irritation of the mucous membrane of the mouth and throat because of a sharp decrease in humidity. However, there is evidence that this feeling is connected with irritation osmoreceptors laid down in the blood vessels, especially in the area of the hypothalamus, and the subsequent spread of excitation on the cells of the cerebral cortex. Osmoregulation centers located mainly in the nuclei of the hypothalamus, which was proved by experiments with irritation these areas by an electric current through implanted electrodes. In animals, thus there is indomitable desire that after the termination of irritation disappears. The tension can be not only a normal reaction of the body to reduce the amount of water, but a symptom of some pathological conditions. Intense thirst (see Polydipsia) appears in diabetes, kidney disease and other
Some patients (especially in the case of diencephalic disorders), on the contrary, you receive the complete absence of needs in drinking (adipsia).
The sensation of thirst can be very strong with abundant perspiration. To prevent thirst when working in hot shops and in the campaigns during hot weather, it is recommended to drink salted water (0,3-0,5% solution of sodium chloride), as salt promotes water retention in the tissues; rinse water of the oral cavity and pharynx; stimulation of salivary flow sparkling water, ledentsovaya sweets, etc.