What is a heart cough?

Heavy breathing accompanied by spells of wet cough with frothy sputum that may be tinged with blood is called as "Cardiac cough or Heart cough". It is a sign of congestive heart failure. Additional symptoms such as shortness of breath on exertion or rest, leg swelling, waking up from sleep in the middle of night gasping and coughing differentiate heart cough from cough due to lung conditions.