Methylcobalamin is mainly used to treat peripheral neuropathy and can treat sensorineural tinnitus. However, there are many causes of tinnitus, including diseases of the ear itself and other diseases of the whole body. If the tinnitus is clearly diagnosed as sensorineural tinnitus, it can be treated with methylcobalamin. If the tinnitus is caused by other reasons, methylcobalamin will not work. The cause of sensorineural tinnitus is unknown and difficult to treat. Although methylcobalamin can be used for the treatment of sensorineural tinnitus, the effect is not exact, especially for tinnitus over three months, and any medication is almost useless. For patients with tinnitus, they need to be seen by an otolaryngologist as soon as possible to clarify the cause of the tinnitus before effective treatment can be given.