Angina pectoris is an acute attack symptom caused by coronary heart disease. Due to coronary atherosclerosis narrowing of myocardial blood vessels, blood flow is reduced, and angina is often triggered by exertion, exercise, emotional stress, straining to defecate, and other situations that increase the burden on the heart. When angina pectoris attacks, the patient will suddenly feel a persistent crushing or suffocating pain under the sternum. The patient first immediately stops all activities, calm down, can rest on the spot, without lying down, so as not to increase the amount of blood back to the heart and thus aggravate the burden on the heart. Immediately take out the portable first aid medicine, such as nitroglycerin, chew a piece of sublingual, usually about two minutes of pain can be relieved. If the effect is not good, you can take another tablet under the tongue after 10 minutes. However, it is important to note that no matter whether angina is relieved or reoccurs, it is not advisable to take more than three nitroglycerin tablets in a row. The drug can maintain its effect for up to 30 minutes. In case of accident, after the drug is effective, that is to find a place to sit down and rest, but patients with glaucoma such drugs can not be taken, otherwise it can be caused by increased intraocular pressure and severe eye pain, headache, blurred vision and even blindness. Coronary heart disease patients with angina pectoris, will be due to the sudden onset of severe pain in the heart and into extreme panic, which is very unfavorable to the relief of angina pectoris, panic will significantly accelerate the frequency of heartbeat, thereby increasing the burden on the heart. First-episode angina patients, often do not carry emergency medicines, encountered in this case do not have to worry too much about the danger, most angina attack lasts less than 10 minutes, in the absence of medicines, stop the activity on the ground to rest, maintain a calm state of mind, is the most effective first aid measures. Prevention: Recently, the weather has been getting cooler, and patients with coronary heart disease should pay attention to keeping warm to prevent angina attacks. Actively prevent and control hypertension, high blood pressure, high blood fat and other dangerous causes of coronary heart disease. Quit smoking, alcohol, high-fat diet and other bad habits, adhere to the vegetarian diet, avoid full meals, keep bowel movement. Maintain a relaxed mood, insist on physical exercise, and avoid excessive excitement. Family medicine: nitroglycerin tablets, fast-acting heart pills, pain relief, etc., and nitroglycerin tablets, fast-acting heart pills to take with you, especially when you go out to be more inseparable; in the home bedside, table and other fixed and easy to take place.