Middle ear mastoiditis is more serious, mainly leading to local symptoms, and in severe cases, it can also cause systemic symptoms. Middle ear mastoiditis is often secondary to recurrent suppurative otitis media, mostly due to bacterial infection, the patient’s external auditory canal discharge pus-smelling abnormal secretion, accompanied by swelling and pain in the mastoid region, and in severe cases, the local skin may break down, and pus secretion will flow out. When the inflammation spreads upward through the bone, it will lead to intracranial complications, such as meningitis and brain abscess, which will lead to death in serious cases. The first step is to go to the hospital for a detailed examination of electronic otoscopy and mastoid CT to confirm the diagnosis. Treatment of mastoiditis requires symptomatic anti-inflammatory treatment with antibiotics. When the inflammation subsides, local surgery is needed.