Ear pain on one side may be caused by trauma, tympanitis, otitis media, neuralgia and so on. 1. Trauma: The ear canal is injured due to friction on one side of the ear, repeated squeezing of the ear, and damage to the external auditory canal when digging the ear, thus causing pain in one side of the ear. 2. Tympanitis: due to viral or bacterial infection of the tympanic membrane, causing tympanitis, which leads to ear pain, tinnitus, stuffy feeling in the ears, etc. 3. Otitis media: Otitis media is caused by bacterial or viral infection and accumulation of foreign bodies in the ear. As a result, ear blockage, ear pain, hearing loss, tinnitus and other symptoms. 4. Neuralgia: With trigeminal neuralgia, the pain can radiate to the ear. You should go to the hospital in time to clarify the cause of the disease and treat the symptoms.