post–lumbar puncture syndrome

the lumbar puncture headache and other symptoms, which may include pain at the back of the neck, nausea, vomiting, sweating, and malaise, felt in the erect position and relieved when the person lies down, lasting from several hours after lumbar puncture for sometimes a few days; it is due to lowering of intracranial pressure by leakage of cerebrospinal fluid through the needle tract.