Heart stenosis, also known as cardiovascular stenosis, is a series of symptoms caused by ischemia and hypoxia of the heart muscle due to narrowing of the coronary arteries in the heart. For example, there is a feeling of tightness and pressure behind the sternum and in the back, which may radiate to the left shoulder, left arm and even the little finger and ring finger. When angina occurs, the pain usually lasts for ten seconds or even three to five minutes. Rarely does it last more than ten minutes or even half an hour. Generally, sublingual nitroglycerin and musk heart pills can quickly relieve the symptoms. The gold standard for diagnosing coronary stenosis in the heart is coronary angiography, which can clarify the degree of coronary stenosis as well as assess the next treatment options.