<s>[INST] Im 17 and I did have a really bad chest not so long ago, it felt like someone was applying pressure to the middle of myChest and sometimes I would find it hard to breathe, I now have a slightShock pain to the bottom left of my rib cage, I dont no what is wrong [/INST] Thanks for your question on Chat Doctor. I can understand your concern. By your history and description, possibility of musculoskeletal pain is more. But better to rule out cardiac and Pulmonary causes for this chest pain. So get done ECG to rule out cardiac diseases. Get done chest x-ray to rule out Pulmonary causes. If both are normal then no need to worry much for your pain. It is mostly due to musculoskeletal pain. So apply warm water pad on affected site. Avoid heavyweight lifting and strenuous exercise. Avoid movements causing pain. You may need painkiller and muscle relaxant Chat Doctor.  Don't worry, you will be alright. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks. </s>