Left ear pain is clinically possible due to the following diseases: first, inflammatory diseases of the ear itself, commonly acute otitis externa, acute tympanitis, acute otitis media and other diseases. The second kind, inflammatory pain in the throat radiating to the ear, commonly includes acute purulent tonsillitis, parapharyngeal gap infection, peri-tonsillitis, etc., especially when the patient swallows, manifesting pain in the throat radiating to the ear. The third type, neuralgia, which manifests as pain in the large nerve behind the ear and so on, can be simply caused by the patient, or may be stimulated by factors such as fire and staying up all night. In the fourth type, some patients have herpes zoster virus that invades the nerves around the ear and causes pain.