Hi Doc !! From last three months I have been having chest pain that comes and goes but only lasts for seconds. The pattern is like 2 sec pain in left side of chest and then after 2 seconds it radiates to left thumb and then vanishes. It happens anytime and not specifically with exercise. It happens at rest too. I sometimes feel it in my left wrist too.  My RHR also stays between 95 - 100. Can it be a serious cardiac issue or is it just a pinched nerve or muscular pain ? Thank you !!