The first thing to consider is the onset of angina pectoris caused by myocardial ischemia in coronary heart disease. It is recommended to improve the electrocardiogram or ambulatory electrocardiogram at the time of pain and, if necessary, coronary CT or coronary angiography to clarify the myocardial ischemia, and to treat the symptoms with temporary quick-acting heart pills and nitroglycerin. In addition, the left side of the rib cage under a burst of tingling, need to pay attention to the skin surface whether there is herpes, to consider the possibility of herpes zoster, if necessary, to the dermatology department for further treatment.