Typical angina usually presents as pain in the upper part of the sternum or the heart socket, which can sometimes radiate to the back and shoulders. The pain is roughly fist-sized and occurs after emotional stress, exertion, a full meal, or straining to defecate. The nature of the pain is usually a squeezing pain, sometimes it can also be manifested as a tightness or squeezing sensation in the pharynx, usually it is not a pinprick pain or tearing pain, or throbbing pain, and usually has nothing to do with breathing. It lasts about 3-5 minutes each time, usually not more than 10 minutes. Electrocardiograms generally show changes such as ST-T segment depression and T wave flattening, or bi-directional inversion. It is important to note that the following conditions may not be angina attacks: First, cardiac neurosis, most commonly seen in young women or menopausal women. Chest pain is often manifested as sharp stabbing pain or tear-like pain, the pain area is generally smaller, such as the size of a needle point, the duration of time is generally shorter, long sighs or activities can be alleviated, most likely not; second, reflux esophagitis or esophageal hiatal hernia caused by pain, generally manifested as the pain behind the sternum, with a burning sensation, when swallowing food, there will be pain or gastric distention, acid reflux, heartburn, etc., after taking omeprazole, the pain is not angina. etc., the symptoms can be relieved after taking omeprazole; third, costochondritis or intercostal neuralgia, mainly manifested as the left or right side of the sternum, there is a coin-like size range of pain, pressure or turn over when the pain is more obvious. The electrocardiogram in the latter cases usually does not show dynamic changes.