Patients with brainstem hemorrhage experience fever generally for the following three reasons: First, infection. Patients with brainstem hemorrhage often have disturbances of consciousness and dysfunction of the throat, and are bedridden, which frequently leads to aspiration pneumonia and hypostatic pneumonia. This is due to weakened ability to clear phlegm, as well as choking caused by saliva and feeding. Additionally, infections can easily occur in the gastrointestinal tract, urinary tract, and from skin pressure sores. Second, abnormalities in the temperature set point cause central hyperthermia. In patients with brainstem hemorrhage, the temperature regulation center is damaged. If the temperature regulating center sets the body temperature above 38 degrees Celsius, it often persists and cannot be reduced, and medications are poorly effective in lowering the temperature, necessitating the use of ice packs for physical cooling. Third, patients with brainstem hemorrhage often use large doses of diuretics. Dehydration after diuretic use can put patients in a state of excessive dehydration. If rehydration therapy is not adequately managed, dehydration fever can easily occur.