According to the American Heart Association, early signs of a heart attack may include:
Chest discomfort. Most heart attacks involve discomfort in the center of the chest that lasts more than a few minutes – or it may go away and then return. It can feel like uncomfortable pressure, squeezing, fullness or pain.
Discomfort in other areas of the upper body. Symptoms can include pain or discomfort in one or both arms, the back, neck, jaw or stomach.
Shortness of breath. This can occur with or without chest discomfort.
Other signs. Other possible signs include breaking out in a cold sweat, nausea or light headedness.