Sufferers describe it as feeling as if they have an elephant sitting on their chests. Chest pain, difficulty breathing, an oppressive feeling. These are symptoms of classic angina, a transient lack of oxygen to the heart caused by blockage in the vessels supplying the heart muscle with blood. In almost all cases, angina is a very serious symptom of heart disease. In this post to HealthConnection.TV, U.T. Health Science Center at Tyler cardiologist Dr. Dudley Goulden answers the most important questions on angina.