Tinnitus is the result of different pathological changes of many diseases involving the auditory system, with complex etiology and unclear mechanism. It is a subjective sensation of sound in the ear or in the skull that is perceived by the patient without the presence of corresponding acoustic or electrical stimuli in the surrounding environment; clinically it is both a concomitant symptom of many diseases and the first symptom of some serious diseases (e.g., auditory neuroma). According to the etiology, tinnitus can be divided into physiological and pathological: under normal circumstances, when the human body is in an extremely quiet environment, one can hear the pulsating sound or breathing sound produced by the pressure on the arteries when the internal organs and organs of the body maintain their natural state of activity and blood flow, and the sound of the opening of the eustachian tube, etc. These are all sub-body sounds and are physiological tinnitus. Tinnitus caused by any external mechanical, noisy, toxic, infectious, allergic reaction, drug ototoxicity and systemic diseases belongs to the category of pathological tinnitus. The site of tinnitus can be in the cochlea, the nerve or the auditory center, or it can be mixed. Tinnitus is often associated with or without hearing loss, sleep disturbances, distress, irritability, inability to concentrate, anxiety, depression, and other adverse psychological reactions, with or without auditory hypersensitivity. Note that tinnitus patients hear meaningless noise. If the patient says he/she hears sounds such as talking and music, then he/she should see a psychiatrist.