Tinnitus is most often described as a ringing in the ears, even if there is no external sound. The sound varies from high to low and can be single-tone, multi-tone or noise-like, with no tonal quality. tinnitus may be constant, pulsating, or intermittent. It may start suddenly or progress gradually.
Even with all of these conditions and associated causes, some people develop tinnitus for no apparent reason. People who work in noisy environments, such as factory or construction workers, road crews or even musicians, can develop tinnitus over time when continuous exposure to noise damages the tiny sensory hair cells in the inner ear that help transmit sound to the brain. Military personnel exposed to bomb explosions can develop tinnitus if the blast's shock wave squeezes the skull and damages brain tissue in areas that help process sound.