In fact, in patients with regular dizziness, the causes are often the following: 1. vertebral artery or internal carotid artery stenosis, causing insufficient blood supply to the brain, resulting in dizziness. Now there is a good way to do CT, intravenous injection of contrast, which is often called CTA, can fully display the blood vessels in the neck, clear and clear. With the progress of technology, this examination should be used as a routine examination. 2, dizziness caused by cervical spondylosis, the principle of which is that the herniated disc compresses the vertebral artery causing insufficient blood supply to the brain. 3, cerebellar infarction or cerebellar tumor causing cerebellar lesions, resulting in dizziness caused by balance dysfunction, which can generally be detected by CT. 4. Dizziness caused by lesions in the ear, due to lesions that cause vestibular dysfunction. Of course, there are other causes such as anemia, lung lesions, etc. that can also cause dizziness, but most of them are caused by 1 or 2. The purpose of this article is to ask the patient to have a CTA examination of the neck when necessary to clarify the cause as early as possible.