Usually there are several aspects of dizziness behind doing so: First, from the orthopedic surgery perspective usually the most common factor is cervical spondylosis, which often occurs after doing open behind the cervical spine disc stenosis, disc bulge and disc edema, congestion. Especially in patients with a previous history of cervical spondylosis, there will be insufficient blood supply to the basilar artery and lead to dizziness. Second, after doing too much time behind, there will be a transient hypoglycemic reaction, and dizziness will also occur in the state of hypoglycemia in people. Thirdly, if coronary artery disease exists in the past, a transient vasospasm of the aorta usually occurs after the preparation, and when the spasm occurs, aortic stenosis will occur, resulting in transient insufficiency of blood supply to the brain and causing dizziness.