What causes angina?
心绞痛的病因是什么？
Angina occurs when there is reduced blood flow to your heart muscle. Blood carries oxygen, which is essential to your heart muscle. The most common reason why reduced blood flow happens is coronary artery disease. It develops when fatty deposits, called plaque, build up in the blood vessels that supply blood and oxygen to the heart. This buildup is also known as atherosclerosis. When you are resting, your heart muscle may still be able to cope with reduced blood flow without triggering angina symptoms. However when you increase demand for oxygen, such as when you exercise or do a strenuous activity, angina can occur.
当流向心肌的血流量减少时，就会发生心绞痛。血液携带氧气，这对心肌至关重要。 最常见的导致血流量减少的原因是冠状动脉疾病。当脂肪沉积（称为斑块）在为心脏提供血液和氧气的血管中积聚时，就会发生这种情况。这种积聚也称为动脉粥样硬化。 静息时，心肌仍然能够应对血流减少，而不会诱发心绞痛症状。但是，当您的氧需求量增加时（例如当您锻炼或进行剧烈活动时），便可能发生心绞痛。