I have had two episodes of chest pain in the last 6 months. The first time it occurred, my doctor told me to let him know if it happened again. It occurred again a week ago Friday, and I had a thalium treadmill stress test on Tuesday of last weekwhich showed everything completely normal. I'm wondering, therefore, what could have caused the angina attacks? My doctor suggested muscle spasm or even an esophogeal reflux, but it felt like neither of those.