A ringing in the ears or hearing impairment. The areas that control hearing are located in the temporal lobe of the cerebral cortex and adjoin those that command linguistic comprehension and language skills. These areas are sited near the temples. Hearing impairment, especially if it is pronounced in one ear, or similarly, a ringing pronounced in one ear, is certainly a possible symptom of a tumor that is placing pressure on the hearing and language centers. If you experience such symptoms, they certainly warrant a visit to a specialist you trust.