The complications of severe pneumonia are as follows: 1. pulmonary impairment: such as respiratory failure, requiring ventilators to maintain respiratory function, and oxygen saturation; 2. renal impairment: causing oliguria, anuria, etc.; 3. infectious shock: manifested as a drop in blood pressure, requiring drugs to control blood pressure to avoid hypotension; 4. cardiac impairment: such as toxic myocarditis, septic myocarditis, which can cause heart damage, increased cardiac enzymes, heart failure, etc.; 5. neurological impairment: manifested as coma, impaired consciousness; 6. hematological impairment: reduced white blood cells, reduced platelets, anemia, etc.; 7. hepatic impairment: increased liver function, jaundice, etc.