Tinnitus is generally classified into either objective tinnitus or subjective tinnitus. The latter is more common. It is described as the tinnitus that cannot be heard by others, which means that only the sufferer can listen to the noise and sounds produced by tinnitus. Unlike the subjective type, objective tinnitus is very rare and is described as the type of tinnitus that other people can hear through the use of special device such as stethoscope that the doctor uses to diagnose the condition. Since it is often associated to serious medical conditions, this type of tinnitus is quite disturbing. Its prevalence accounts to only 3 percent of all tinnitus patients.