Ear root pain may be caused by acute otitis externa, acute pharyngitis, or cancer of the external auditory canal. You can’t tell what kind of disease it is by the symptom of “ear root pain”. 1. Acute otitis externa: acute otitis externa is caused by damage to the skin of the external auditory canal or infection of pathogenic microorganisms in the external auditory canal, etc. Inflammatory factors may cause irritating pain in the ear, and thus pain in the root of the ear occurs. 2. Acute pharyngolaryngitis: acute pharyngolaryngitis is caused by viral or bacterial infection, and when inflammation occurs, due to the involvement of glossopharyngeal nerve, radioactive pain in the root of the ear occurs when doing swallowing movement. 3. Cancer of external auditory canal: Due to various factors, cancer of external auditory canal grows, and in the process of disease evolution, the symptom of ear root pain may appear. Ear root pain may also be caused by otitis media, periauricular lymphadenitis, mumps, etc. One should go to the hospital in time to consult the doctor and follow the doctor’s instruction for targeted treatment after clarifying the cause of the disease.