Tinnitus in the left ear may be a symptom of cerumen impaction, otitis externa, otitis media, sudden deafness, trauma to the left ear, and left auditory neuroma. 1. Cerumen impaction: The left ear secretes more cerumen, which is not cleaned out in time to form a blockage of the ear canal and cause tinnitus in the left ear. 2. Otitis externa: swelling of the left external auditory canal and irritation of the tympanic membrane by secretions from the external auditory canal can cause tinnitus in the left ear. 3. Otitis media: Inflammation of the left middle ear, the inflammatory factor stimulates the left inner ear tissue causing tinnitus. 4. Sudden Deafness: Sudden and unexplained sensorineural deafness on the left side can lead to tinnitus on the left side. 5.. Trauma to the left ear: trauma to the left ear such as external impact, resulting in tympanic membrane rupture damage, can cause tinnitus, ear pain 6 left auditory neuroma: a neurilemmoma originating from the Schwann cells of the vestibular or cochlear branch of the left auditory nerve. Early symptoms are tinnitus in the left ear, hearing loss in the left ear, vertigo and other manifestations. Tinnitus in the left ear, it is recommended to consult a doctor in time to find out the cause of the disease as soon as possible treatment.