There are several main reasons for itchy tongue: first, due to fungal and viral infections, or unbalanced nutrition in the body, B vitamins, trace elements, will lead to inflammation of tongue papillae, tongue filiform papillae inflammation will cause atrophy of the tongue papillae, so that the surface of the tongue body is reddish and thinning. Inflammation of the tongue fungiform papillae, the papillae will be red, swollen, congested, like strawberry, also known as strawberry tongue, tongue papillitis can lead to mild tingling symptoms. Second, suffering from oral mucosal dryness syndrome, the disease mostly occurs in 40-50 years old women, mainly due to the decline in the function of salivary glands, so that the saliva secretion is significantly reduced, and triggered by oral dryness, which caused the tongue tingling, taste dysfunction as well as numbness of the sensation. Third, ulcers of the tongue mucosa, tongue ulcers will also have itching, pain and discomfort in the early stage.