Patients with insufficient blood supply to the vertebrobasilar artery often have the following clinical symptoms: 1. Vertigo is the most common symptom, and the nature of vertigo can be rotational, floating, swaying, or sensations such as lower limb tenderness, unstable standing, ground movement or tilting. It is more likely to be triggered or aggravated when the patient changes position, over-extension and flexion of the head and neck or lateral rotation; it can also be triggered by emotional factors, exertion, car ride and walking. Some patients with vertigo may have unilateral or bilateral tinnitus. 2. Visual impairment: Patients may suddenly experience reduced vision or blindness, which may last for several minutes. Diplopia is also not uncommon. In addition, there may be flashes of light, dark spots, visual field defects, and even hallucinations. 3. Headache: mainly located in the occipital or parieto-occipital area, or confined to the neck, but may also radiate to the deep parts of the two temporal sides, and its nature is mostly throbbing and swelling pain. Headache is often accompanied by nausea, vomiting, sweating and other symptoms of autonomic dysfunction; 4. Motor disorders can be divided into: medullary paralysis syndrome, such as slurred speech, swallowing difficulties, choking on water, soft palate paralysis, etc.; facial nerve, manifested as a mild paralysis of the facial nerve; limb paralysis, which can occur as monoplegia, hemiplegia or quadriplegia, the degree of which is mostly mild paralysis, and complete paralysis is rare. Sometimes the patient does not complain of limb discomfort, but the examination can also find that the limbs have mild cone fasciculation signs; balance disorders and ataxia, manifested as a balance disorder of body position and gait, many patients have nystagmus; 5, sensory disorders: such as facial sensory abnormalities, pins and needles or numbness, perioral or tongue numbness; single limb, double limb or quadruple limb can be seen with numbness or hypoesthesia, pain is rare; 6, visceral Disorders of consciousness: nausea, vomiting, epigastric discomfort, sweating, and respiratory rhythm disturbance; 7.