Patient: sudden dizziness Laboratory internal diameter, flow velocity, right common carotid artery; 0.7064 intracarotid; 0.4776 vertebral artery; 0.3046 left common carotid artery; 0.6595 intracarotid; 0.5949 vertebral artery; 0.3065 bilateral carotid arteries; the intima is not smooth, the posterior wall at the beginning of the left internal carotid artery can be seen in the range of about 0.68X0.26CM strong light spot attached to the wall, local color Filling defect. The internal diameter of the vertebral arteries was narrow bilaterally. I am 56 years old, always dizzy, and I had an ultrasound. Please help me to see if it is serious and how to treat it. Thanks in advance! Gao Xuguang, Department of Neurology, Peking University People’s Hospital: Lesions in the carotid arteries do not cause dizziness. It is recommended to do cerebrovascular imaging to see if there is stenosis or atherosclerosis in the posterior circulation (vertebrobasilar system). Long-term treatment with statins and aspirin is possible.