There is no authoritative information to show how long it takes to get through the dangerous period after a fall, most patients will get through the dangerous period within a week, if there is severe pain, nausea and vomiting after the fall, you need to consult a doctor in time. How long it takes to get through the dangerous period after a fall needs to be judged according to the severity of the fall, if there is a mild fall, the patient is only scalp bruises, no intracranial hemorrhage or brain tissue damage manifestations, generally not dangerous. If the fall is severe, with intracranial hemorrhage and concussion, it may take up to a week to pass the danger period. If the patient has a severe headache, projectile vomiting, optic nerve disk edema and other conditions after a fall to the back of the head, it is most often considered to be due to intracranial hemorrhage. Patients need to go to the hospital in time to do brain CT or intracranial MRI examination, which is conducive to determine the severity of the disease. How long it will take to get through the dangerous period should be judged according to the patient’s condition, and the patient should be observed first after the fall. If the headache and other discomforts need to consult a doctor in time, follow the doctor’s instructions to take appropriate measures to avoid delaying the condition.