Angina, or chest pain, is the most frequent sign of the start of heart failure. It is felt when the blood supply to the heart becomes restricted because of a narrowing in the blood vessels supplying oxygen to the heart’s muscles. The main symptom of angina is a chest pain that feels like a dull ache or tightness. It can spread to the arms, neck, jaw, or back. Often, it is triggered by physical exertion. Angina is not life-threatening, but it can be a sign of more serious underlying conditions, and it’s essential to consult a doctor.