Dry tongue is a common symptom, the causes and improvement methods are mainly the following: 1, due to the lack of vitamins and trace elements of zinc, you can take oral zinc gluconate, drink more juice, eat more green leafy vegetables to improve; 2, due to the reduction of salivary gland secretion in the mouth, generally seen in the elderly, caused by gland atrophy, there is no particularly good treatment, you can eat more hawthorn 3, seasonal factors, generally dry weather in autumn and winter, there will be a dry tongue, you can boil water with pears and rock sugar to drink, has the effect of moistening; 4, if often stay up late, irritable temper will lead to heart fire, liver and kidney Yin deficiency, etc., will also lead to a dry tongue, you can take oral treatment such as Tianwang Tonic Heart Dan, Zhuangyao Wan, Liu Wei Dihuang Wan; 5, if it is If a diabetic patient has a dry tongue, it is mainly due to increased blood sugar and needs to be treated by actively lowering blood sugar.