The headache after anesthesia is mainly due to intradural anesthesia during anesthesia, which breaks through the dura mater and causes cerebrospinal fluid leakage, and the patient manifests low cranial pressure headache. The symptoms of headache are reduced when the patient is lying down, and aggravated when sitting down. Patients are advised to drink more water, the purpose of drinking more water is to increase the production of cerebrospinal fluid, so that the intracranial pressure rises, relieving the phenomenon of low cranial pressure headache. It is recommended that patients go to the pillow lying position for 6 hours after anesthesia, and then drink more warm water to prevent headache after anesthesia. Anesthetic also has side effects that can cause headache in patients.