<s>[INST] Hello, I m a 27 yo male and today I hurt the underside of my rib cage. My bottom left, heart side. I bent my upper body on a piece of equipment and the equipment leaned over with me on it. I heard a popping sound coming from underneath my rib cage, followed by sharp instant pain. However, 5 min later the pain stopped and I can breathe fine. However, if I press hard in that area or lean on it. There is sharp pain again. What could this be? Thanks [/INST] Hi, The sharp pain can be related to a soft tissue injury, rib fracture or a muscle spasm. Rest and using a chest belt will help. Hope I have answered your query. Let me know if I can assist you further. Take care Regards, Dr Praveen Tayal, Orthopaedic Surgeon </s>