By the way, you will also find that the blood pressure in your left arm is higher than in the right. This is because the blood exits the heart on that side.

There are a few other problems with taking blood pressure. Since blood pressure is generally taken with a stethoscope, the reading will actually vary according to the person's hearing that is taking the blood pressure. And I used to train medical personnel how to take blood pressures properly. I was forever getting on people about putting their thumb on the stethoscope during the readings. This is a definite no-no!!! The thumb has a pulse that can be picked up by the stethoscope and can give false readings.