 3. Cold Sweats. If you're suddenly drenched in a cold sweat, especially if this is not something that's normal for you or if the weather does not indicate that you should have this type of reaction, it could be a sign of heart attack. Number 4. Nausea or vomiting. Sometimes a heart attack symptom can present in the stomach area. Nausea and vomiting can tag along, so don't dismiss them. 5. Shortness of breath. If you are feeling unusually breathless, much more so than the norm for you. Then, this shortness of breath is not necessarily your lungs. It could be a heart attack in disguise.