Numbness of the tongue may be caused by tongue injury, lingual inflammation, tongue cancer and other reasons, the specific reasons need to go to the hospital for examination to determine. 1. Tongue injury: when the tongue is burned or bitten, it will cause some damage to the tongue, thus making the tongue appear numb, which is generally a normal reaction, and if the symptoms are not serious, it is usually not necessary to carry out. 2. Tongue inflammation: Tongue inflammation is usually caused by lack of vitamin, anemia, abuse of antibiotics, malnutrition, etc. The disease mostly occurs in the front part of the tongue, and the patients will have the symptoms of conscious numbness, pain and burning pain when eating, and some of the patients may have the symptoms of erosion of the corners of the mouth, dryness and flaking, and cracking. 3. Tongue cancer: Tongue cancer is usually caused by malnutrition, poor oral hygiene, long-term smoking, drinking and infection, etc. Tongue cancer patients often have ulcers, and after ulcers are infected, severe pain, numbness, dysfunction of swallowing, halitosis and other symptoms may occur. There are many reasons causing numbness of tongue. If there are symptoms, patients should go to the hospital for medical treatment in time, and follow the doctor’s instruction for treatment after diagnosis. Patients should avoid eating cold, spicy and other stimulating foods during the period of treatment, so as not to aggravate the symptoms.