Numbness of the tongue and dizziness may be caused by the following diseases: First, brain nerve dysfunction, because the brain is very rich in function, the brain emits the linguopharyngeal nerve, hypoglossal nerve, facial nerve, etc., which plays a regulatory role in tongue sensation as well as movement, if the nerve dysfunction of the brain is unable to dominate the tongue or conduct normal sensation, there will be such a situation as numbness of the tongue. When the brain nerve is damaged, it is also unable to produce normal thinking consciousness and sensation, which will produce dizziness. Second, it may be due to cerebral infarction, cerebral hemorrhage, etc. When a person has cerebral infarction, cerebral hemorrhage and other cerebrovascular lesions, it will be accompanied by damage to the brain nerves and brain cells, and when the motor and sensory nerves that govern the tongue are damaged, it will lead to numbness of the tongue, cerebral hemorrhage or cerebral infarction and other cerebrovascular diseases can lead to increased intracranial pressure or blood pressure, which will cause dizziness.