Numbness of the tongue requires a visit to neurology. There are two cases of tongue numbness: 1. There is organic disease. If there is an injury to the central nervous system, resulting in a functional deficit of the nerve that innervates the sensation of the tongue, tongue numbness will occur. This nerve usually emanates directly from the brainstem, which is the facial nerve and the linguopharyngeal nerve, so it is necessary to improve the cranial magnetic resonance examination to clarify whether there are abnormal foci in the brainstem, and whether there are tumors or other occupying lesions around the brainstem that compress the nuclei and nerve roots of the facial nerve and linguopharyngeal nerve. 2, functional disease, some patients will appear subjective abnormal sensation, while the objective examination are normal, to be considered as Neurosis, or somatization disorder caused by anxiety and depression. Before making this diagnosis, it is also necessary to improve the cranial magnetic resonance examination to exclude organic diseases. Both of these conditions can be seen in neurology.