Brain stem hemorrhage 3~5 ml is generally dangerous, because the brain stem is the life center of the human body, after the damage can appear cranial nerve damage, consciousness disorder, limb motor and sensory dysfunction and so on. 1. Damage to cranial nerves: patients may suffer from vision loss, hearing loss, eye movement dysfunction, crooked mouth and eyes, chewing dysfunction, swallowing dysfunction and so on. 2. Impaired consciousness: if the patient has bleeding, it may lead to impaired consciousness, which may be manifested as drowsiness, lethargy, coma and so on, and may be life-threatening in serious cases. 3. Limb motor and sensory dysfunction: after the brainstem is damaged, it can be manifested as limb motor dysfunction, sensory dysfunction and so on. After suffering from brain stem hemorrhage, it is recommended that patients should go to the hospital in time and take reasonable treatment under the guidance of doctors.