For cerebral hemorrhage, if it is a small amount of cerebral hemorrhage, the patient is conscious and can move all four limbs, usually 3 weeks can pass the dangerous period. The most dangerous part of this period is 1-3 days, when there is a great risk of brain hemorrhage increasing again; 7-10 days after the hemorrhage, when brain swelling is at its peak, and there is also a great concern about the risk of brain swelling, which can compress the nerves and lead to hemiplegia and limb disorders. For some massive brain hemorrhage, even causing brain hernia, the risk period should be extended appropriately, in a month to a month and a half, because at this time, although there is also a risk of re-bleeding of the brain as well as swelling of the brain, there is also a risk of some other complications, infection of the lungs, venous thrombosis of the lower limbs, bedsores and a series of conditions, as well as whether the patient’s brain is stable. In the case of craniotomy, there is also the risk of intracranial infection, so the recovery period and the risk period is relatively long for some of these serious cases.