Ear pain on one side can be caused by acute diffuse otitis externa, otitis externa boils and herpetic tympanitis. 1. Acute diffuse otitis externa: also known as diffuse otitis externa, the patient’s main symptoms are itching, pain, diffuse congestion, swelling, epidermal erosion of the external auditory canal, often manifested as auricular pulling pain and ear screen pressure and pain. 2. External auditory canal boil: also known as limited otitis externa, caused by infection of the hair follicles in the cartilage of the external auditory canal. The main symptom is severe, throbbing earache, especially when opening the mouth and chewing, often radiating to the head. 3. Herpetic tympanitis: also known as hemorrhagic herpetic tympanitis, mainly caused by viral infection of the peritoneum primary inflammation, the patient usually manifests as a deep persistent distension of the ear or tingling, and can be accompanied by headache and cheek pain on the same side. In addition, it may also be caused by ear neuralgia, acute tympanitis and other conditions, it is recommended that patients go to the hospital in time for relevant examinations, to clarify the cause of the disease, and targeted treatment.