Really, thanks for posting all this! I'm not well versed in all of the signs to watch for in cardiac problems. It's nice to have someone whose personal experience gives you a clue that perhaps the discomfort in your chest during a climb may be something to keep an eye on. Heartburn type pain is dismissed too easily by me....it may be more than that in some cases. I knew I should have been paying attention in "old fogey orientation" class!