Heart Pain More Condition_symptoms Why After Cup Of Coffee And/or Stress Some Peoples With Heart Illnesses Have Heart Pain?

Why after cup of coffee and/or stress some peoples with heart illnesses have heart pain? - heart pain more condition_symptoms

Presumably in these cases (coffee and stress) are working harder heart. But if the pain is the reason why the person is not in pain during the exercises intensive sport (when the heart) to work harder?