Vertebral artery reverse flow spectroscopy represents the presence of blood theft within the vertebral artery, called subclavian artery theft. Blood flow spectrum refers to ultrasound Doppler spectral analysis, which is a clinical term for qualitative and quantitative analysis of blood flow to understand the direction, velocity, and nature of blood flow to help diagnose disease. Subclavian artery steal refers to a group of syndromes in which partial or complete occlusion of the head and arm trunks or the proximal end of the subclavian artery before it divides into the vertebral artery causes a reversal of the flow of blood from the affected vertebral artery due to siphoning (steal), which in turn supplies blood to the ischemic upper extremity, leading to ischemic episodes of vertebrobasilar artery ischemia and ischemic symptoms in the affected upper extremity. Dizziness, ataxia, abnormal limb movement can occur when blood is stolen from the subclavian artery, and in severe cases, it can even cause cerebral infarction, such as hemiplegia, hemiplegia, speech disorders, and consciousness disorders, etc. Cerebral angiography and stent implantation are feasible. When the vertebral artery reverse blood flow spectrum occurs, you need to go to the hospital in time, under the guidance of the doctor for appropriate treatment.