Angina is primarily caused by what?

Angina is a condition characterized by chest pain or discomfort due to inadequate blood flow to the heart muscle, often as a result of coronary artery disease. When there is poor blood circulation to the heart, the heart may not receive enough oxygen, especially during physical exertion or stress. This lack of oxygen is what leads to the characteristic symptoms of angina.

While regular exercise can help improve cardiovascular health and is typically beneficial, it does not cause angina; in fact, it can often alleviate symptoms in a healthy heart. High blood pressure can contribute to heart disease over time but is not the direct cause of angina episodes. Lastly, while infections (like myocarditis) can impact heart function, they are not a primary cause of angina. Thus, the correct answer emphasizes the critical role of blood circulation in heart health.