In some patients the pain may be less intense, while in other it may last longer, and occur in places other it may last longer, and occur in places other than the centre of the chest, in the shoulder, jaw or back. Others with angina may also have breathlessness and nausea.
Angina results because of insufficient blood supply to the heart, and the resulting insufficient oxygen and nutrition to the heart muscle. This happens when heart’s oxygen demand increases and the blood vessels are incapable of supplying the same. That’s why angina occurs during exercise or emotional stress.