Why can't I sleep with a pillow after surgery?

The spinal anesthesia you mentioned is medically called spinal anesthesia. Generally, a person is punctured between the third and fifth spaces of the lumbar vertebra into the spinal epidural space, and then anesthesia drugs are injected. After the puncture, a needle eye will be left. The external cavity is connected to the brain. If the head is raised after surgery, part of the cerebrospinal fluid may flow to the surface of the spinal cord and flow to the epidural along the needle eye, resulting in low intracranial pressure and headache. Lie on your back for six hours with the pillow removed. During this time, the eye of the needle in the area of the spinal anesthesia has been closed, so it will not cause low intracranial pressure headache.

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