Otitis media can cause meningitis, brain abscess and other intracranial infectious diseases, which may present with headache, vomiting, fever and other symptoms. 1. Meningitis: In addition to systemic symptoms of infection such as fever and chills, symptoms of increased intracranial pressure such as severe headache, vomiting, drowsiness and coma, as well as symptoms of neurological damage such as hemiparesis and aphasia may also occur. 2. Brain abscess: its systemic symptoms may be more obvious and intense, including fever, activity weakness, myalgia, loss of appetite, etc., accompanied by increased intracranial pressure such as vomiting, and in severe cases, visual loss, neck stiffness, frequent pulse, hypotensive coma, etc.. It may also lead to injuries such as epidural abscesses and sigmoid sinus thrombophlebitis, with symptoms similar to those described above. If otitis media is suspected to cause intracranial infection, or if symptoms such as headache and vomiting as mentioned above occur, it is recommended to go to the hospital in time for diagnosis and standardized treatment.