Shortness of breath is the most common warning sign of heart failure.
Angina is a temporary pain, tightness or pressure in the chest that occurs if the heart muscles don't get enough oxygen. Swelling of the legs and feet can indicate heart disease, especially if other symptoms are present. Calf muscle pain that occurs when you walk also can signal heart disease, particularly if it occurs only with activity and stops a minute or two after the activity ceases. One-quarter of all heart attacks happen without warning. Usually there are symptoms, though many people mistake them for other conditions and don't seek help soon enough.