The right side of the rib cage has a painful pang, which may be caused by intercostal muscle strain, chondromalacia, or intercostal neuritis, as follows: 1. Intercostal muscle strain: for example, sitting in an improper posture, often twisting and sitting, can cause an imbalance in the force on the intercostal muscles bilaterally, resulting in intercostal muscle strain on one side, manifesting as soreness and pain on one side of the rib cage. 2. Intercostal chondromalacia: may be due to cold or mental stress stimulation 3, intercostal neuritis: mainly caused by viral infection, manifested as a circular distribution along 1-2 intercostal spaces, the pain mainly presents burning-like pain, stabbing sensation.