What causes arm pain during heart attack?
Well first off to answer your question the pain that some people have in their arm(s) during a heart attack is a referred pain. Referred pain is when you experience in one part of your body when the problem is really in another part of your body. Good examples of this would be how some people who have an appendicitis will complain of pain in their right shoulder. Or will complain of pain in there left abdomen. Secondly and more importantly is the fact that you stated that you have significantly higher b/p in your right arm compared to your left arm. This is something you need to report to your doctor right away. Significantly differing B/P in the arms is a sign of a possible aortic aneurysm. An aneurysm is a ballooning of a blood vessel due to weakening of the vessel wall. If an aortic aneurysm ruptures, that is it you will be dead in a matter of a couple seconds. The fact that you have hypertension also supports the diagnosis of an aneurysm. Good Luck!
