The phenomenon of buzzing in the left ear may be neurogenic tinnitus, or it may be caused by cerumen impaction or purulent otitis media. 1. Neurogenic tinnitus: Symptoms caused by lesions or functional abnormalities of the cochlea, auditory nerve and central auditory pathway, which can be manifested as buzzing, cicadas and other sounds, and therefore can also occur in the left ear buzzing phenomenon. 2. Cerumen impaction: If there is a large amount of cerumen in the left external auditory canal and part of it is close to the eardrum, when it falls out or loosens, buzzing may occur. 3. Suppurative otitis media: Buzzing may occur due to the presence of a large amount of fluid or pus in the left ear canal, which disrupts the sound transmission structure and is close to the eardrum. Buzzing in the left ear can also be caused by other reasons, it is recommended to identify the cause and actively cooperate with the doctor for treatment.