Tingling inside the left rib cage may be caused by intercostal muscle strain, costochondritis, and intercostal neuritis. 1. Intercostal muscle strain: it is a more common cause of clinical symptoms of tingling inside the ribs, most patients are due to long-term sitting posture, so that the bilateral intercostal muscle uneven force, resulting in one side of the intercostal muscle strain, thus appearing inside the left rib tingling situation. 2. Costal chondritis: the specific cause of this disease is still unclear, but the main consideration is related to viral infection or mental stimulation, which may also appear inside the left rib tingling. 3. Intercostal neuritis: this kind of disease is mainly caused by viral infection, and the patient’s pain is mainly characterized by semi-ring or band distributed pain along the intercostal space. In addition, coronary heart disease, pleurisy and so on can also cause tingling in the left rib cage, it is recommended that patients go to the hospital in time for a detailed examination, and under the guidance of professional doctors, actively cooperate with the treatment.