There are many reasons for tongue tingling, such as food allergy, viral infection and burning mouth syndrome. 1. Food allergy: patients have allergic phenomenon to certain food, which can cause tongue sometimes scratching phenomenon, and also accompanied by the phenomenon of itching lips. 2. Viral infections: Oral viral infections can cause herpes, which may cause the tongue sometimes scratching phenomenon, and there will also be a certain degree of pain. 3. Burning Mouth Syndrome: Burning Mouth Syndrome is mainly characterized by burning pain, which can be manifested by abnormal sensation of the tongue, thus resulting in the phenomenon of scratching of the tongue sometimes. There are many reasons why the tongue is sometimes scratchy, and it is recommended to go to the hospital in time to improve the examination and take standardized treatment according to the doctor’s instructions, so as not to ignore the symptoms and take them lightly.