There are two reasons for headache symptoms after surgery: First, local anesthetic can cause headache symptoms, which will usually be relieved after 2-3 days after the anesthetic has passed. Secondly, the patient is in a dehydrated state, most of them fast before the surgery, some body fluid will be lost during the surgery, and they cannot eat after the surgery. At this time when the fluid supplementation is not sufficient, the effective circulating blood volume decreases and the blood supply to the brain also decreases, then the patient will have headache symptoms, and it is recommended that the patient after surgery must be given sufficient amount of fluid.