Numbness of the tongue is generally caused by the following signs: 1. Stomach Yin deficiency. Stomach yin deficiency, as the name implies, is a symptom of insufficient fluid and water inside the stomach, a symptom of stomach yin deficiency. Stomach yin deficiency will appear as numbness and dryness of the tongue, yellow and dry tongue coating, cracked tongue, map tongue, and flower peeling moss. At this time, it needs to be treated by nourishing stomach yin, and can be treated with the Chinese herbal medicine Yu Nian Decoction, Ping Gastric San, or with Sha Shen Mai Dong Tang.2. If the tongue is not dry, there is no map tongue, but the tongue feels numb, and the running movements of the tongue are not able to effectively turn left, right, or off to the side. This is the time to consider whether there is a central nerve lesion, such as tongue stiffness caused by stroke or brain tumor.