I have some tightness just in the left side of my chest on the top of the pectoral. I also have some on and off twitches that come and go in my heart area. I don t know if it is a muscle twitch or my heart. I don t have shortness of breath. My blood pressure is 120 over 80 mid afternoon and 116 over 75 morning. I am 63 years old I weigh 161 lbs. and 5 5 tall I also lift weights. Just curious there isn t any heart conditions in my family. I did over extend my left shoulder this summer and has some muscle twitching down my left arm for two weeks and that stopped. I do have an appointment with a heart doctor this month. I feel great.