Since a few years ago, 72-year-old Mr. Wu has often felt cold and numbness in his right hand, especially when the weather gets cold. He had been diagnosed with cervical spondylosis and peripheral neuropathy, etc. After treatment through physical therapy, neurotrophic and dilatation, his symptoms were sometimes mild and sometimes severe. However, over the past year, he started to feel pain in his right finger again, and upon close observation, it seemed that the color of the tip of his right finger was still slightly pale. So, he came to the neurology department of Wuhan First Hospital, and the pulse check found that the right pulse was weak, and the difference in blood pressure between the left and right sides was more than 30 mmHg, and the right side of the blood pressure dropped significantly. After imaging, he was diagnosed with severe stenosis of the right subclavian artery, which was rapidly relieved by implantation of a stent for expansion. How did it become a stent when it was just a cold finger? It turns out that if the subclavian artery is narrowed, the blood supplied to the brain by other blood vessels will be sucked out of the brain to supply the affected limb, which is known as “blood theft” in medicine. Under certain triggers, cerebral infarction may occur, resulting in paralysis, ataxia, slurred speech and sudden collapse. In fact, subclavian artery stenosis is not rare, but many people do not pay attention to it, coupled with the fact that the manifestation of the disease is not specific, and most of the early stage will be missed and misdiagnosed. Generally speaking, mild to moderate subclavian artery stenosis, clinical asymptomatic, no special treatment; but moderate to severe stenosis is easy to lead to the upper limbs and brain blood supply shortage, resulting in cold hands and upper limbs or dizziness, etc.; and ischemia is severe, if not treated in time, not only will appear hand ischemia necrosis, may also lead to cerebral infarction. Meanwhile, subclavian artery stenosis is most commonly still caused by atherosclerosis. Therefore, in daily life, strict control of hypertension, diabetes, hyperlipidemia, obesity, elimination of smoking, low-fat diet will reduce the possibility of subclavian artery stenosis. If there are symptoms such as long-term recurrent cold and numbness in the fingers, or pain and whiteness in the fingertips of the fingers, there is no need to worry too much, and you can go to a regular general hospital for consultation. Generally speaking, palpation of bilateral pulse or measurement of bilateral blood pressure can mostly indicate the symptoms; most of them can be diagnosed by ultrasound examination; finally, the diagnosis can be confirmed by imaging examination.