If you are having a heart attack, which happens when parts of the heart do not receive enough blood flow, you may notice some of the following symptoms:
Chest pain. Pain in the center or left side of the chest is one of the most common signs of a heart attack. You may feel a tightness, fullness, or squeezing sensation that can last for several minutes.
Discomfort in the upper body. This can include pain in the arms, shoulders, neck, jaw, back, and stomach.
Shortness of breath. While this symptom usually accompanies chest pain, it can occur before the discomfort starts.
Lightheadedness. In combination with other symptoms, feeling as though you are about to pass out is a common indicator of a heart attack.
Heart palpitations. You may begin to feel irregular or skipping heartbeats.