Tinnitus is a common symptom in otolaryngology and is a subjective sensation of various ringing sounds in the patient’s ear without a corresponding source of sound in the outside world. There are subjective tinnitus and objective tinnitus. In subjective tinnitus, the sound of tinnitus is felt only by the patient and cannot be heard or detected by the examiner. Objective tinnitus, on the other hand, can be heard by both the patient and the examiner. Subjective tinnitus, except for some diseases of the external auditory canal and middle ear that can be detected, is mostly referred to as sensorineural tinnitus, and is the most difficult to treat. Tinnitus caused by diseases of the ear itself is often accompanied by symptoms such as hearing loss or vertigo of varying degrees. Tinnitus has a variety of sound manifestations, commonly described as cicadas, sirens, hissing bells and so on. It can occur intermittently or persistently; in mild cases, it occurs when it is quiet, and in severe cases, it seriously affects life and work. Conductive tinnitus is mostly low-pitched, and sensorineural tinnitus, which is often a high-pitched cicada sound. Some tinnitus may be a precursor of a certain disease, such as in patients with hypertension, where increased tinnitus indicates a rise in blood pressure; tinnitus may be a precursor to heart disease. Tinnitus can also be a precursor to heart disease. Because of the many causes of tinnitus, treatment of tinnitus can be difficult. Understanding the nature of tinnitus and finding the cause of tinnitus is the key to treating it.