Unilateral persistent tinnitus may be caused by outer ear canal lesions, middle ear lesions, inner ear lesions, and trauma. 1. Lesions of the external auditory canal: for example, cholesteatoma of the external auditory canal, otitis externa, tumors of the external auditory canal, cerumen embolism of the external auditory canal, etc. can cause unilateral persistent tinnitus, hearing loss, earache and other symptoms. 2. Middle ear lesions: acute suppurative otitis media, middle ear cholesteatoma, etc. can cause unilateral persistent tinnitus, accompanied by dizziness, ear stuffiness, ear blockage and other symptoms. 3. Inner ear lesions: for example, cochlear lesions, acoustic neuroma, can appear unilateral persistent tinnitus, hearing loss, vertigo and other symptoms. 4. Traumatic injury: unilateral ear by external impact caused by hearing local tissue and nerve damage, can appear persistent tinnitus, ear pain and other symptoms. Unilateral persistent tinnitus, it is recommended to consult a doctor in time to find out the cause of the disease and standardize the treatment as soon as possible.