The Probert Encyclopaedia of Medicine

ANGINA

Angina is sense of suffocating or pain in the chest caused by a lack of blood being supplied to the heart muscle, thereby causing insufficient oxygen to be supplied to the heart. The cause of the pain is suspected to be a build-up of irritant acids in the heart muscle deprived of oxygen, not unlike the ache one feels in other muscles during and after strenuous exercise.
Research Angina