What could cause a permanent tinnitus?

Hearing damage: Tinnitus is ringing in the ears caused by damage to the hearing nerve. It can come from a one-time event (rock concert) or multiple events over time. It is typically heard at the frequency of the damage. It is essentially the brain thinking it heard a sound at that frequency when there is no sound. The brain hears it because of the damage and does not always resolve treatment is not very effective.

Tinnitus: The best course of action is to visit a physician. Pulsatile tinnitus from a vascular source, and tinnitus due to an acoustic neuroma need to be ruled out first. The most common kind of tinnitus is non-pulsatile and caused by Noise- Induced Hearing Loss. Tests to diagnose include hearing tests, scope of the eustachian tube, MRI and imaging studies, physical exam, and laboratory tests. Good luck.