Otitis externa can be categorized as acute diffuse otitis externa, chronic otitis externa, and necrotizing otitis externa. Acute diffuse otitis externa and necrotizing otitis externa may cause symptoms of headache. Chronic otitis externa has predominantly localized symptoms and no headache symptoms. 1. Acute diffuse otitis externa: the main symptom is swelling and pain in the ear, which can be aggravated when talking or chewing, and with the development of the disease, symptoms such as secretion in the ear, hearing loss and localized swelling can occur. In some patients, the swelling and pain in the ear may radiate to the head and cause headache. 2. Necrotizing otitis externa: persistent earache, and the pain gradually increases. If granulation appears in the external auditory canal, or pus and blood secretion, it may cause fever, headache and other symptoms, and may even invade the brain nerve and cause facial paralysis. When the above discomfort symptoms occur, it is recommended to consult a hospital for a definitive diagnosis and treatment.