1, diseases of external ear and middle ear: such as cerumen obstruction, eustachian tube, otitis media, otosclerosis, etc. Tinnitus is not serious and can disappear after etiological treatment;

2, inner ear labyrinth lesions: such as Meniere's disease, ototoxic drug damage, noise stimulation, etc. Tinnitus is often more serious;

3, auditory neuropathy: such as acoustic neuritis, acoustic neuroma, the latter tinnitus is progressive, accompanied by headache, dizziness and other symptoms;

4, central lesions: such as cochlear nucleus and auditory pathway lesions, can cause intractable tinnitus. Otogenic tinnitus is characterized by hearing loss.