The Basics
What You're Hearing Is Real
Tinnitus is the perception of sound — a tone, a hum, a hiss, a ring — without an external source producing it. It isn't a disease in itself. It's a symptom, usually of an underlying change in your auditory system, most often hearing loss.
For the vast majority of people, tinnitus is subjective — only you can hear it. In rare cases it's objective, meaning it can actually be measured — and that usually points toward a vascular or muscular cause a physician should investigate.
The sound can be constant or come and go. It can live in one ear, both ears, or seem to originate somewhere inside your head. It can be barely noticeable one day and consuming the next. Every version is worth taking seriously.