Hot water can not relieve angina, angina is caused by coronary artery stenosis, common causes are strenuous exercise, emotional stress, excitement, full meals, infections, etc., increased oxygen demand leads to an imbalance between the heart oxygen demand and oxygen consumption, followed by angina symptoms. Once angina occurs, it is necessary to exclude the causes of angina, remove the causes, and give sublingual nitroglycerin or quick-acting heart pills, compound salvia drops, etc. Through the above treatment, the patient’s symptoms can gradually disappear within 2-3 minutes, and very few patients need half an hour to relieve. If the pain is more than half an hour and cannot be relieved by taking the above drugs several times, it should be considered as myocardial infarction rather than angina pectoris, and patients should actively go to the hospital for electrocardiogram, cardiac ultrasound, coronary CTA, coronary angiography and other examinations to clarify the degree of lumen stenosis.