Since tinnitus is not an independent disease, the causes of tinnitus are complex and still under discussion in the medical community, it is difficult to unify the classification of tinnitus. The following classification is based on objective and subjective nature. Objective tinnitus: Also known as other-perceived tinnitus, it is a kind of tinnitus that can be heard by oneself and others. It is rare and can be characterized by rhythmic horseshoeing, pendulum sounds or other rhythmless murmurs. Causes of other-perceived tinnitus include: abnormalities in the arterioles or aneurysms in the skull and neck that produce pulsating tinnitus consistent with a pulse. In addition, such as spasm of the soft palate and auditory tuberosities, and abnormal opening of the eustachian tube, tinnitus consistent with the rhythm of breathing can often be heard. Subjective tinnitus: Also known as spontaneous tinnitus. Only the patient can feel the tinnitus, and it can be one-sided or bilateral. The nature of the tinnitus is varied and can be in the form of ringing, buzzing, whistling, whistling, insects, etc. There are various causes of subjective tinnitus, and the common causes include: inflammation of the external ear canal, cerumen foreign bodies, tumor obstruction, otitis media, intra-drum lesions, otosclerosis, Meniere’s disease, ototoxic drug poisoning, etc.