Tinnitus is ringing sound or noise in the ear. The characteristic feature is that the origin of this sound is within the patient. Usually, it is unilateral but may also affect both ears. It may vary in pitch and loudness and has been variously described by the patient as roaring, hissing, swishing, rustling or clicking type of noise. Tinnitus is more annoying in quiet surroundings, particularly at night, when the masking effect of ambient noise from the environment is lost.
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