Itchy tongue can be caused by the following reasons: First, there is trauma to the tongue. If you eat overly hot or hard food that causes trauma to the tongue, such as herpes on the tongue, the main manifestation is itchiness, which will heal in about a week. Second, eating food that causes allergies. Allergies not only cause itchy tongue, but also itchy lips. If you often eat allergic food, it may endanger your whole health. Third, the tongue is infected with a virus. In the early stages of viral infection, before the herpes grows, there may be pioneering symptoms such as itching and pain in the tongue, which require timely antiviral treatment.