The right side of the rib cage is a bit sore for two reasons: First, due to costochondritis, such as frequent external stimulation, cold or trauma, it is easy to form chronic sterile inflammatory lesions in the rib cartilage, especially when cold, and sleep due to incorrect posture, resulting in significant extrusion and stimulation of the rib cage tissues, also easy to induce soreness in the right side of the rib cage. Second, because there are more muscles attached to the right side of the rib cage, such as the pectoralis major, pectoralis minor and intercostal muscles, when the muscle tissue is overworked and accompanied by cold, it will easily lead to the accumulation and increase of lactic acid and inflammation and other related metabolites, and when it reaches a certain level, the lactic acid will stimulate the peripheral nerves and cause a feeling of acidity, and after the inflammation stimulation After the inflammatory stimulation, there will be obvious pain, and the symptoms related to soreness will appear.