Tinnitus ("TIN-a-tus" or "Tin-EYE-tus") refers to "ringing in the ears" when no other sound is present. Tinnitus can sound like hissing, roaring, pulsing, whooshing, chirping, whistling, or clicking. Tinnitus can occur in one ear or both ears. Below are some commonly asked questions about tinnitus. Is tinnitus a common problem?