There are three main dangerous stages of cerebral hemorrhage, namely, rebleeding stage, cerebral edema stage, and complication stage. 1. Re-bleeding stage: within 72 hours after the occurrence of cerebral hemorrhage, the vital signs of patients are extremely unstable, and the probability of re-bleeding caused by vasospasm of ruptured blood vessels is higher, and the risk of re-emergence will be reduced after 72 hours in general. 2. Cerebral edema stage: cerebral edema generally reaches its peak 7~10 days after cerebral hemorrhage, in addition, the edema period will be longer for patients with larger amount of bleeding, which is also a dangerous stage after cerebral hemorrhage. 3. Complications stage: common complications usually include lung infection, intracranial infection, upper gastrointestinal bleeding, central hyperthermia, etc., which need to be paid attention to and are prone to occur in about three weeks. In these periods are likely to appear more dangerous situation, need to closely observe the patient’s condition, according to the occurrence of the condition of active treatment.