The normal diameter of the vertebral artery at the beginning of the segment is 3~5mm, and 1.6mm at the beginning of the segment indicates the existence of vertebral artery stenosis, which requires timely medical treatment. The vertebral artery is connected to the basilar artery. If the internal diameter of the vertebral artery at the beginning of the vertebral artery becomes small, the basilar artery will be easily supplied with insufficient blood, which will lead to general symptoms of cervical spondylosis such as dizziness and neck pain, and also cause migraine headache, memory loss, and so on. An initial segment of 1.6 mm indicates the presence of vertebral artery stenosis, which requires prompt intervention. If there is vertebral artery stenosis and symptoms such as dizziness and neck pain occur, it is recommended that the patient reduce the weight-bearing activities of the neck and immobilize the neck with a cervical brace, which can effectively reduce the symptoms. However, the most important thing is to consult a doctor for professional treatment without delay, so as not to aggravate the condition.