Some side difference in blood pressure between the right and left arms is normal and not dangerous. Differences in the range of 10 to 20 mmHg of the upper blood pressure value and up to 15 mmHg of the lower value are not suspect.
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If the difference between the two arms lies above it, the cause of this great difference must be found out. An artery may be blocked in the shoulder arm area. As a result, the blood pressure in the affected arm would be lower. A vascular specialist should investigate this in any case and exclude serious causes.
author:Dr. med. Julia Hofmann