The treatment of left mastoiditis includes medication and surgery. 1. Medication: firstly, use hydrogen peroxide or saline to clean the middle ear, then drop of ofloxacin ear drops, at the same time, antibiotic drugs such as intravenous penicillin, levofloxacin injection can be used. 2. Surgery: such as mastoid open surgery, mainly grinding or chiseling the sinus, the lesion tissue is completely removed, and then remove the entrance of the sinus and some lesion tissue on the mastoid air cavity, the surgery can not only fully drain, but also completely remove the lesion. After surgery, inflammatory infections should be prevented and treated with antibiotics, such as oral cephalosporin tablets or intravenous penicillin for anti-inflammation. Patients with left-sided mastoiditis should consult a doctor in time, choose the appropriate treatment plan under the guidance of the doctor, and pay attention to reasonable rest during the treatment process.