The cause of fever earache may be acute diffuse otitis externa, acute mastoiditis, acute suppurative otitis media and so on. 1. acute diffuse otitis externa: this is a widespread infectious inflammation of the skin and subcutis of the external auditory canal, which is more common in otological diseases, and its etiology is due to bacterial or viral infection, and common causative organisms include Staphylococcus aureus, hemolytic streptococcus and so on. 2. Acute mastoiditis: this is a purulent inflammation that occurs in the mucous membrane of the mastoid air cavity and the mastoid bone, and it is mostly a complication of acute suppurative otitis media. The causes of this disease include strong virulence of pathogenic bacteria, drug resistance, insensitivity to commonly used antibiotics; patient’s weakness, poor resistance, and poor drainage of pus. 3. Acute suppurative otitis media: this disease is an acute suppurative inflammation occurring in the mucosa of the middle ear, preferably in children, with a high incidence in winter and spring, often secondary to upper respiratory tract infections. The main causative organisms include pneumococcus and Haemophilus influenzae. When the symptoms of fever and earache appear, it may also be acute pharyngitis, etc., and should seek medical treatment in a timely manner to clarify the cause of the disease, and then carry out targeted treatment under the guidance of the doctor.