There are a large number of nerves behind the left ear, such as the auricular nerve, occipital nerve, auriculotemporal nerve, vagus nerve, and many other nerve branches. Patients with the following pathologies may have pain behind the ear: first, ear disease, acute otitis externa, acute tympanitis, acute otitis media, ear inflammation spreading to the back of the ear or inflammation radiating through the nerve to the back of the ear, resulting in painful throbbing behind the ear The second is parotid gland disease. Secondly, parotid gland diseases, such as mumps, can have similar manifestations. Third, lymphadenitis behind the ear. The source of inflammation in lymphadenitis can be stimulated by an inflammatory infection in the throat or by inflammation elsewhere in the body. Fourth, auricular herpes zoster, a viral invasion of the nerve can also present this pain. In conclusion, patients with throbbing pain behind the ear are generally considered to have neuropathic pain, but clinical attention should also be paid to careful observation for other diseases.