Hi and welcome to Healthcaremagic. Thank you for your query. I understand your concerns and I will try to help you as much as I can. No, this is not something that you should worry about since this is normal variation of kidneys size and two kidneys are never the same size. Only if this is larger than 14cm or smaller than 6 cm it may indicate some diosrders. Also it will not affect your blood pressure unless there is some parenchimal kindeys disorder and for that to evaluate, the size itself would not be sufficient. YOu should do additional: 1. Doppler ultrasound and blood flow measuremnet 2. Blood urea and creatining 3. Holter blood pressure measurement. These tests will show if blood pressure is determined by kidneys or heart function and then you ll have more info about how to treat it. I hope I have answered you query. If you have any further questions you can contact us in every time. Kindly regards. Wish you a good health.