Arterial hemorrhage is a type of vascular surgery disease, which is complex, difficult to treat, and extremely harmful to patients. So how can you check whether you are suffering from arterial blood theft in time? Determine the skin temperature to compare the temperature difference between the two sides of the limb at the same level. When the skin temperature of a certain part is significantly lower than the opposite side and other parts of the same side (the difference is greater than 2℃), it indicates that the arterial blood flow in that part is reduced, such as arterial embolism, chronic arterial occlusive disease. Clinical manifestations of recurrent TIA of the internal carotid artery system, such as lesion side – passing black haze, contralateral reversible mild hemiparesis, limb numbness and aphasia, etc.; the internal carotid artery pulsation is weakened or disappeared, and vascular murmurs can be heard. The routine blood and CSF examinations are generally non-specific. 1.Transcranial Doppler ultrasound (TCD): To detect the vasculature and blood flow in the neck, the affected side of the bundle arm test should be performed, and changes such as reverse blood flow in the vertebral artery can be measured. 2.Digital subtraction angiography (DSA): focus on the subclavian artery and common carotid artery and other vessels on both sides of the aortic arch. If severe stenosis (mostly 85% of the lumen) or almost occlusion is found in the subclavian or cephalothoracic trunk, the diagnosis can be confirmed if the contrast agent is seen to travel upward to the basilar artery and downward (reverse flow) to the distal segment of the affected subclavian artery.