Stabbing pain at the left side of the rib cage: first, consider patients with intercostal neuralgia, mostly seen in young people, which is a functional disease, not an organic disease, most of them have this symptom when they have mood swings or work stress or do not have good rest at night, each time the pain is longer, and also clinical manifestations such as chest tightness and shortness of breath, etc. No special drug treatment is needed, mainly Psychological counseling is the main focus or lifestyle control. Secondly, some patients with coronary artery disease, mostly elderly patients, may experience angina pectoris with symptoms such as chest tightness, shortness of breath, and dyspnea, which can be relieved by rest or sublingual nitroglycerin. Finally, it is also seen in patients with intercostal neuralgia, where the pain is relatively fixed and the symptoms are aggravated when the painful area is pressed, mainly with local medication, and if necessary, further examination should be done in hospital.