Coronary angina is often agonizing for the patient. The typical symptom is chest pain. There are many reasons that can cause chest pain, therefore, some patients are often not vigilant, so that the best time to delay treatment. Some people who attach great importance to health, chest pain in the hospital, sometimes often make a big deal. In this regard, angina pectoris has the following characteristics, to understand the grasp to be able to do their own effective identification. 1, chest pain occurs suddenly angina attack of chest pain, the patient often little or no aura, in the period between the two attacks, the patient’s feeling can be completely normal. Therefore, sudden onset of chest pain is a very important danger signal of angina. Some patients often confuse chest pain with stomach pain. Generally speaking, stomach pain is often accompanied by acid vomiting and burning sensation in the upper abdomen, and the pain of stomach pain is mainly hidden pain. The onset of gastroparesis is closely related to improper eating, and there is no obvious connection with activities, mood swings and mental tension. 2, chest pain site in the anterior chest When angina, the patient’s chest pain site in the anterior chest, that is, to the left anterior axillary line, the upper edge of the sternum to the upper abdomen as the boundary of the region. The most frequent site is in the upper and middle part of the sternum. In a few patients, chest pain also radiates to the jaw or mouth, but the vast majority do not radiate to the mid-abdomen. We have encountered patients who came to the hospital because of toothache or sore throat, the result was diagnosed as angina attack. 3, colic is difficult to accurately describe angina attack, the patient is often difficult to accurately express the location of the pain. Often described chest pain with oppressive, constrictive, obstructive or suffocating sensations, rather than real pain. However, patients are afraid to continue activities, which is a common characteristic of angina patients. 4, chest pain episodes last for a short period of time Angina episodes often last for three to five minutes, a very short period of time. The duration of more than half an hour is relatively rare. However, if the onset of chest pain is very short, instantaneous, and like a pinprick or “lightning-like” pain, most of them are not angina pectoris, but may be intercostal neuralgia, or due to premature heartbeat caused by chest discomfort. 5, related to emotions labor, excitement, anger, agitation, panic, etc. may induce angina, especially after meals, cold weather is still outside walking, cycling, more likely to make chest pain attacks. This is one of the important features of angina. Patients who have this situation, the first thing to consider angina attack. 6, the consistency of the chest pain attack Although the pain symptoms of angina attack can be slightly different from patient to patient, but, specifically for each patient, the pain always occurs in the same location, and the duration of the same time, the nature of the pain is also the same. The main differences are in the degree of urgency, the size of the area involved, and the severity of the discomfort. These reasons for the difference, and the severity of coronary heart disease has a close relationship, while the doctor diagnosis of angina pectoris is not obvious significance. 7, nitroglycerin effective Chest pain attacks, or before the attack, as well as before exercise, sublingual nitroglycerin, angina pectoris patients, there is a significant therapeutic effect or preventive effect. This is very important when diagnosing angina. Chest pain not caused by angina, after taking nitroglycerin, often does not play a role in relieving pain. Warm reminder: angina is one of the signals of the danger of coronary heart disease, especially in patients with frequent episodes or severe degree. Once angina occurs, it means that the condition is more serious, should actively take the necessary preventive and curative measures.