The association between the use of the "pill" and changes in blood pressure in young women was the subject of this study. Here, 11 healthy subjects were examined with an initial mean age of 16 years to two fixed points in time by means of a long-term ambulatory blood pressure measurement. Subjects were confined at the front of the first blood pressure measurement the weight and size, including for the determination of BMI, recorded and performed a standardized ultrasonography of the urinary tract. The raw data obtained were evaluated using the modified LMS correction (by classification according to size) to Scavenge et al. in SDS values and thus transformed a normally distributed form. In summation of risk factors were registered after taking oral contraception blood pressure changes in the form of a rise in blood pressure.