What to do when angina occurs depends on the specific situation. If you suspect a heart attack, seek medical attention as soon as possible. If it is the first occurrence of angina and has not been clearly diagnosed and treated, the first step to take is that you should go to the hospital for examination and diagnosis. First, it is necessary to determine whether it is angina pectoris. Second, if it is angina, you need to do the appropriate tests, to check the electrocardiogram, cardiac enzymes, troponin and so on. It is very important to distinguish whether it is angina or acute infarction, especially acute infarction is a disease with fatal risk, so it needs to be examined and treated in time. If angina has been diagnosed in the past, there are also oral medications to take. Then it is important to pay attention to the triggering factors, duration and severity of this occurrence of angina pectoris. If the trigger, duration and severity are similar to those in the past, sublingual nitroglycerin can be taken to relieve chest pain. However, if 3 tablets in a row do not help, seek medical attention as soon as possible. If angina has been diagnosed in the past and this episode of angina is worse, more extensive, and longer in duration, be on the alert for an attack of heart attack and seek medical attention as soon as possible. If the previous angina mostly has triggers, such as excitement and exertion. But if there is sudden onset of chest pain without obvious triggers, along with profuse sweating, vomiting and nausea, you should be alert to an attack of heart attack and seek medical attention as soon as possible. If there are no cases requiring emergency treatment as mentioned above, usually pay attention to a light diet, quit smoking and drinking, and maintain a good lifestyle. And adhere to long-term oral antiplatelet, anticoagulation and anti-ischemic drug therapy.