Buzzing in the left ear medically refers to tinnitus, which has many causes. If the tinnitus is due to a disease, it usually does not heal on its own. Some episodes of tinnitus that are short-lived and have no obvious cause can heal on their own. The causes of buzzing in the left ear can be cerumen embolism, secretory otitis media, otitis externa, transient tinnitus, inner ear disease, etc. If cerumen embolism is the cause, it usually improves after removal of the cerumen. If it is caused by otitis media, tinnitus can be improved after the inflammation subsides with proper medication. If the tinnitus is transient, it is usually caused by insufficient rest or anemia, and usually improves after adequate rest and improvement of anemia. If the tinnitus is caused by inner ear disease, some patients can be cured with pharmacological intervention. If the tinnitus lasts for a short period of time and has no precipitating cause, it has a tendency to heal itself and usually does not require special intervention. For patients who have frequent buzzing in the left ear, it is recommended that they go to an ENT department for an examination to clarify the cause and then treat it symptomatically.