Numbness in both fingers and tongue is seen in the following cases: a. If an elderly patient has numbness in both fingers and tongue, ask the patient if there is any other symptoms such as weakness in one limb, dizziness or choking on water, etc. A cranial magnetic resonance examination is needed to understand if there is acute cerebrovascular disease, such as cerebral infarction. Electromyography can also be performed to understand whether the numbness is due to myogenic numbness or neurogenic numbness. Second, if it is a young and middle-aged patient, ask the patient whether there is numbness in the feet, numbness in the body, weakness in the limbs and dizziness, then it is necessary to do cranial MRI and cervical spine MRI to understand whether there is demyelinating disease, and also improve electromyography. Third, the patient appears to have numbness in both fingers and tongue, then the patient should be asked if he or she has been taking certain drugs for a long time. There are some patients who take vitamin B6 for a long time can easily cause vitamin B6 accumulation, which can appear nerve damage and numbness of the tongue and both fingers.