One of the most common heart attack symptoms is sweatiness, often accompanied by clammy palms. The good news about sweating during a cardiac event is that it's one of the symptoms most likely to cause a heart attack sufferer to reach out for help [source: WebMD]. In fact, among the heart attack sufferers, sweating typically ranks higher than chest pain in terms of getting people to the hospital.
Researchers are not sure why sweating makes people reach out for help more than other symptoms of a heart attack. It may mean that sweating is more troubling to patients, or perhaps that sweating is a sign of a more serious heart attack. Whatever the reason, when accompanied by other symptoms of a heart attack, sweatiness is a clear sign that something is wrong. If you begin sweating excessively for no apparent reason, call 911 right away. This is especially important if you have sweatiness combined with other heart attack symptoms, such as upper body discomfort, which is the next symptom on our list.