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 chest tightness, shortness of breath and dyspnea. Finally, it is also seen in patients with intercostal neuralgia, where the pain is relatively fixed and the symptoms are aggravated when pressure is applied to the painful area, and is mainly treated with local medication.