Coronary angina attacks require certain triggers, and their intervals are inconclusive and there is no fixed time period for the attacks. New angina of coronary heart disease is caused by localized narrowing or spasm of the coronary arteries leading to myocardial ischemia or even infarction. Its common triggers include cold weather, strenuous exercise, satiety, emotional excitement and so on. Coronary angina pectoris mainly manifests as pressure pain behind the sternum, dyspnea, profuse sweating, and the symptoms last about 15 minutes or so. At this time, patients need to take nitroglycerin under the tongue, and the symptoms will gradually be relieved. If the patient stops the triggering factors, and the symptoms continue to worsen after taking nitroglycerin, myocardial infarction may occur, and you need to immediately call 120 emergency telephone to seize the golden rescue time. It is recommended that patients with a history of coronary heart disease and angina pectoris should always have quick-acting heart pills and nitroglycerin on hand to avoid accidents.