Heart attacks are often depicted with intense pain and where a person suddenly clutches his or her chest and falls over. However, many heart attacks start slowly, as a mild pain or discomfort. The warning signs of a heart attack might include chest discomfort, discomfort in other areas of the upper body, shortness of breath, breaking out in a cold sweat, nausea, or light-headedness. Even if you are not sure whether you suffer from a heart attack, it is always advisable to have it checked out. Fast action saves lives.