Numbness of half of the face can be seen in the following diseases: the first one, peripheral facial nerve palsy, also called peripheral facial neuritis. The main manifestations are numbness of the affected facial muscles, paralysis of the expression muscles, disappearance of the frontal lines, inability to raise the eyebrows, inability to close or incomplete closure of the eyelids, exposure of the white sclera, and distorted corners of the mouth. The second type, otogenic facial nerve palsy, is mostly caused by otitis media, vaginitis, mastoiditis and other peripheral facial nerve palsy, often with a clear history of the original disease and specific symptoms. The third type, posterior cranial fossa tumor or meningitis, mumps, and purulent mandibular lymphadenitis, causes peripheral facial nerve palsy, often with other symptoms of brain nerve damage and specific manifestations of various primary pathologies. The fourth type, neuro-Lyme disease, is unilateral facial nerve palsy, or bilateral onset, often accompanied by fever and wandering erythema of the skin, often involving other cerebral nerves. All of these disorders have a similar presentation to peripheral facial nerve palsy, manifesting as numbness on one side of the face. The fifth type, transient ischemic attack, often presents with sudden onset of numbness and weakness on one side of the face and one limb, and may be accompanied by vertigo, balance disorders, abnormal eye movements or diplopia, which may resolve within a short period of time. The sixth type of stroke is numbness and paralysis of the affected side of the face and limbs, which is usually difficult to relieve. The seventh type, cervical spondylosis, is caused by the compression of cervical nerve roots by cervical spine osteophytes, resulting in numbness, swelling and other sensory disturbances in the areas where cervical nerve endings are located, such as the face, auricle and tongue.