The differential diagnosis of acute otitis media includes diseases such as acute otitis externa, external auditory canal boils, and acute tympanitis. 1. Acute otitis externa, external auditory canal boil: its main symptoms are pain in the ear and obvious pulling pain in the auricle. There is swelling at the opening of the external auditory canal and in the ear canal, partly confined to boils, and the surface of the tympanic membrane is slightly inflamed or normal, but hearing is usually normal and unaffected. 2. Acute tympanitis: Most of the cases are complicated by colds and herpes virus infections, which are characterized by severe earache, but the hearing loss is not obvious. Examination of the tympanic membrane can be seen to be congested with blood to form large blisters, usually does not occur perforation of the tympanic membrane. Patients with acute otitis media should go to the hospital in time, not self-diagnosis, should be actively treated under the guidance of the doctor.