The possible vascular effects of noise were studied. A study of the carotid vessels was made with Doppler ultrasonography in two groups of subjects exposed to various intensity of noise. The following data were studied: age, blood pressure, serum cholesterol, blood glucose, smoking habits, excess weight, electrocardiographic anomalies, family history of vascular disease, connection with duration of exposure and the type of noise and with audiometric deficits, and cerebrovascular modifications after postural changes and after a stress test. The control group comprised subjects not exposed to noise. The findings confirm that noise does play a role in causing vascular modifications that can be detected early by use of Doppler ultrasonography. This technique is predictive and could be useful in screening campaigns, following the method suggested here.