I've posted this question before a couple of years ago and since summer is here again, my symptoms are back. I feel chest pain whenever I'm feeling hot. If i stand outside in the sun when it's 80 degrees or warmer, my chest pain starts within 2 minutes. I've had 2 nuclear stress tests in the last 3 years and they both came back negative, as well as a stress echo done just a month ago. My question is, is chest pain in heat caused by heart disease?