The discomfort of the left side of the rib cage may be due to the existence of chronic gastritis, costochondritis, cardiovascular disease and other reasons. 1. Chronic gastritis: generally due to unclean diet or excessive stomach acid, etc., when there is chronic gastritis, the left side of the ribs can be produced after eating a feeling of stuffiness, at this time can be through the massage, take omeprazole, etc. for targeted treatment. 2. Costal chondritis: If long-term strain causes aseptic inflammation of the costal cartilage, it will also produce a sense of discomfort, which can be initially relieved by taking aspirin, diclofenac sodium and other drugs. 3. Cardiovascular disease: when there is the problem of coronary heart disease, generally in the sternal part of the pressure pain at the same time will be accompanied by rib swelling, chest tightness and other symptoms, should promptly seek medical attention. In short, the left side of the rib cage suffocation causes are diverse, when the situation is more urgent should consult the doctor in a timely manner to clarify the cause of the disease in order to take targeted treatment.