The cardiac reflex zones are mainly the upper abdomen, neck, pharynx, jaw, teeth, left shoulder, inner left arm and left back scapular area. When a patient develops severe myocardial ischemia, radiating pain can occur in the cardiac reflex zones in addition to angina pectoris. When a patient has severe myocardial ischemia, pain signals, called referred to as referred pain, can occur in other areas away from the heart, and the area of the heart where referred pain occurs is called the reflex zone in clinical practice. The reflex zones of the heart are more numerous and complex. Cardiac reflex zones generally include the jaw, throat or teeth, and patients may experience tightness in the throat, toothache or tightness in the jaw. Secondly, in the left shoulder and arm, patients will have sinking and numbness in the left shoulder and arm, and patients may also have pressure pain in the scapular region of the left back. In addition to this, common cardiac reflex zones include the upper abdomen. If the patient has discomfort in the relevant areas, and combined with chest tightness and other symptoms, please complete the relevant examinations immediately to clarify the cause of the disease, and follow the doctor’s instructions to standardize the treatment.