Colds with dry mouth and throat may be due to elevated body temperature and reduced water intake. 1. Elevated body temperature: After a cold, the virus invades the bloodstream through the mucous membranes of the upper respiratory tract, and as an exogenous pyrogen triggers the hypothalamus to elevate the thermoregulation point. The body produces heat through the mechanism of skin vasoconstriction to reduce heat dissipation and increase skeletal muscle contraction, resulting in evaporation of water from the mouth and throat, which leads to the appearance of a dry mouth, dry tongue, and dry throat. 2. Reduced water intake: After a cold, the virus is transported with the blood to all tissues of the body, causing tissue non-specific immune response, involving the gastrointestinal tract, can cause gastrointestinal peristalsis weakened, loss of appetite, dyspepsia, nausea, vomiting and other discomforts, at this time, the water, food intake is reduced, the body lacks of water is also part of the reason for the dry mouth, dry tongue, dry throat. Dry mouth, dry tongue, dry throat can also be caused by other diseases, such as symptoms do not ease or aggravation, need to actively seek medical attention, clear cause for targeted treatment.