Why do you have different blood pressure in different arms?
It is very normal for your health care provider to measure your blood pressure in both of your arms. Having different blood pressure in each arm may signal a health problem.
A blood pressure difference of a few points between arms isn’t usually a cause for concern and is quite normal. However, a difference of greater than 10 points may indicate trouble.
In younger people, a blood pressure difference between arms can happen when a muscle squeezes the blood vessel (artery) that supplies the arm. It can also happen because of a structural problem that blocks the blood from flowing smoothly through the artery.
In elderly people, a blood pressure difference between arms may indicate blocked arteries in their arms or other health issues such as diabetes.