A very common condition typified by the perception of sound in the absence of an acoustic stimulus. The sound may be of a buzzing, ringing, roaring, whistling or hissing quality or may involve more complex sounds that vary over time. It may be intermittent, continuous or pulsatile (synchronous with the heartbeat).

• Damage to inner ear or cochlea
• Middle ear infection or result from just about any ear disorder
• Aneurysms
• Hardening of the arteries
• Several medications