Patients are often accompanied by low intracranial pressure after lumbar puncture. How long does low intracranial pressure take to heal depends on the amount of cerebrospinal fluid extracted by the patient, as well as the patient’s own repair ability and whether the patient has serious intracranial infections combined with other factors for objective analysis: a. If the amount of cerebrospinal fluid extracted by the patient is small and his own repair ability is strong, there is no serious infection in the patient’s cranium at this time. In this case, the patient’s symptoms of low intracranial pressure can be gradually relieved within 24-48 hours after performing lumbar puncture and will not cause serious complications. Second, if the patient extracts more cerebrospinal fluid, his own repair ability is poor, and the patient has a more serious intracranial infection. At this time, the patient’s low intracranial pressure symptoms often last for a longer period of time, and some patients even need about a week to fully return to normal.