Shortness of breath
This is yet another common symptom associated with heart attack, although breathlessness indicates several other pathologies as well, especially those related to the lungs. When taking a flight of stairs is usually not a problem, but suddenly, walking a few steps up is making one breathe heavily, this could be a signal towards a heart attack, especially if they are at risk of it. Since the heart is responsible for supplying the body with oxygenated blood, a small amount of physical exertion during the condition can provoke shortness of breath.