Most people think chest pain is a symptom of heart attack. In recent decades, however, we have learned that heart attack symptoms aren't always so obvious. Symptoms may show up in different ways and can depend on a number of factors in different persons and can affect different bodily locations.
If blood flow is not restored to your heart muscle within 20-40 minutes, irreversible death of the heart muscle will start to occur. Heart muscle will continue to die for about 5-8 hours. This can cause disability or death depending on how much the heart muscle is damaged.