Patients with hearing loss in the left ear first need to go to the hospital for a detailed examination. In some cases, the hearing loss is caused by a large amount of cerumen in the outer ear canal. After the cerumen is completely removed, the hearing of the patient’s left ear can be restored to normal. In some cases, the hearing loss is caused by inflammation in the middle ear cavity. In terms of treatment, oral antibiotics and drugs to promote drainage are needed, and clindamycin phosphate granules are commonly used in clinical practice, along with Oronema drops. If the hearing loss in the left ear is neurological, patients are often advised to take oral ginkgo biloba extract tablets, nicergoline tablets or cytarabine sodium capsules for treatment, while patients can also perform hyperbaric oxygen therapy, which is also helpful for hearing loss. Regardless of which of the above causes, after active treatment, hearing loss should have a significant improvement.