Basilar artery spasm is a condition in which the smooth muscle of the basilar artery contracts strongly, causing narrowing of the lumen and resulting in inadequate blood supply to the vertebral basilar artery. The main symptoms of basilar artery spasm include dizziness, headache, nausea, vomiting, numbness, weakness, and blurred vision. The underlying disease causing the spasm should be treated, such as antiplatelet drugs and statins for atherosclerosis, or surgery if the disc herniation is severe. The spasm of the basilar artery will be relieved after the underlying disease is resolved.