Brain stem hemorrhage is usually caused by the rupture of small blood vessels in the brain stem or the extension of brain hemorrhage foci to the brain stem. Brain stem hemorrhage usually has no specific precursor, and the early manifestations of the onset of the disease include headache and dizziness, nausea and vomiting, eye abnormalities, and impaired consciousness. 1. Headache and dizziness: Due to the increase of intracranial pressure, headache will spread to the whole head. Headache is usually accompanied by dizziness, which may occur briefly or recur repeatedly and worsen slowly. 2. Nausea and vomiting: As the location of brainstem hemorrhage is close to the vomiting center, the hematoma formed during brainstem hemorrhage directly presses the vomiting center, which will cause nausea and vomiting. 3. Eye abnormalities: elevated intracranial pressure will cause patients to develop eye symptoms. Pupil dilation, sudden blackness in front of the eyes, blurred vision, impaired eye movement and other symptoms may recur. 4. Impaired consciousness: after the occurrence of brainstem hemorrhage, patients are prone to irritability, slow movement, less flexible limbs and other symptoms, and sometimes there is a transient loss of consciousness. Brain stem hemorrhage is a more serious disease, if you find the above abnormalities, you should go to the hospital in time and follow the doctor’s instructions for treatment.