Surgery is usually required when there is a space-occupying lesion in the thyroid gland. Headache after surgery may be related to special posture, anesthesia reaction, intraoperative stimulation and other reasons. 1. Special posture: Patients need to adopt a special posture during surgery, i.e., the head needs to be tilted back and stretched as far as possible to fully expose the neck. Such a special posture, which usually needs to be maintained for 2-3 hours, will cause some strain on local muscles and nerves, especially the occipital nerve, so some patients may feel headache after the operation. 2. Anesthesia reaction: Thyroid surgery needs to be performed under general anesthesia, but anesthetics have a certain effect on the circulatory system of the human body, which may cause changes in blood pressure, thus leading to headaches. Anesthesia is usually fully metabolized 24 hours after surgery, and the headache will gradually subside. 3. Intraoperative stimulation: The vagus nerve, cervical plexus and other local nerves may be stimulated during surgery, which may also lead to postoperative headache. When post-thyroid surgery headache occurs, it is recommended to follow the doctor’s instructions for further examination, clarify the cause with the doctor’s help, and carry out targeted treatment or therapy.