What are the common symptoms of heart failure?

Some symptoms of heart failure are fatigue and weakness; shortness of breath upon exertion or lying down; swelling of the legs, ankles or feet; irregular or rapid heartbeat; and a reduced ability to exercise, according to Mayo Clinic. The increased need to urinate at night is also a symptom.

Persistent coughing or wheezing accompanied by white or pink phlegm is a symptom of heart failure, as well as difficulty in concentration, lack of alertness, sudden shortness of breath and sudden weight gain from fluid retention, notes Mayo Clinic. Those suffering from severe symptoms associated with heart failure such as fainting, rapid heartbeat and chest pain should seek medical attention immediately.