If you have a sudden decrease in hearing, especially with a change in mental state (confusion, delirium) or dizziness, go to the ER.If there is a significant difference between hearing in one ear, you should be evaluated by an otolaryngologist.You have hearing loss along with tinnitus on one side. If only one ear has ringing, it may be a sign of an underlying condition like infection, a tumor, or trauma. It should be evaluated by an otolaryngologist.