Crushing chest pain as a sign of a heart attack, is really putting off a potential problem. so if anything, i think what we've learned today is that if you've gone through a vessel bypass or had stents put in, and you don't feel well and can't explain it, you can't put off seeing a physician, you need to get to the hospital right away. >> so a general lack of well-being, is that how you describe it? or a general exhaustion? what would you call a key symptom for having a heart -- potential heart attack is what we're talking about here? >> you know, when you say as a man who's had heart disease,...