The characteristic of stable angina pectoris is that the pain part is relatively fixed, and the pain part is mostly located behind the sternum, and can also affect the precordial area. Usually, it has a palm size range, and some ranges are relatively wide, even across the chest. The boundary is not very clear, and it can radiate to the left shoulder, the inner side of the left arm directly to the ring finger and little finger, and can also radiate to the neck, pharynx Mandible. Some patients may have pain in the upper abdomen and back, or angina pectoris, which should be differentiated from digestive tract diseases such as peptic ulcer, cholecystitis, pancreatitis, etc. In patients with stable angina pectoris, the pain location has not changed for weeks to months. In patients with unstable angina, the location of pain may change.
