For asthenic fever, the tongue is dry and red, with a rough surface, indicatingthat it is a serious case. When the tongue is more moistened, the condition isbetter and easier to cure. There is also another asthenic fever where the fur is yellowish red in color with a rough surface; when combined with other factors,the condition can be diagnosed as serious.

In another kind of turbid fever, the tongue proper may loseits original colors, and there will be a dry tongue and mouth.
In epidemics, the tongue fur is an important indication for the severity of thecondition: when the Hay fever is not yet differentiated into clear or turbid type,a thick,greasy fur demonstrates an exuberant toxic fever, although it is not yet fatal.

In visceral disorders, fur is also important for inspection. Spleen disease serevealsa piebald fur like a map.

In child patients, inspection of the tongue should be encouraged. A dry mouth and tongue with thick fur indicates a serious condition. In heart disease patients,there might be an atrophied tongue, indicating that Tibetan medicine also connectsthe heart to the tongue.
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Source :http://www.tcmadvisory.com/index.asp