Patients in severe coma usually wake up within one month, if they cannot wake up within three months, the prognosis is relatively poor and they may not wake up, and some patients can wake up within one year. Patients in severe coma have different causes, and the time of awakening and prognosis may also vary. For example, the length of coma after cerebral hemorrhage depends on the actual condition of the patient and is related to the site of hemorrhage, the amount of hemorrhage, the presence of serious complications such as hydrocephalus, increased intracranial pressure, pneumonia, pulmonary embolism, etc. It is also closely related to the degree of coma. Therefore, the duration of coma and the ability to wake up depend on the severity of the actual condition. If the patient cannot be awakened within a year, he or she may be in a coma for a long time and the chance of awakening is relatively small. Through early active treatment, after the condition is stabilized, rehabilitation treatment measures such as acupuncture, massage, limb massage and passive limb activities can be used to promote awakening and prevent limb contracture at the same time, which is conducive to functional recovery.