Thanks for your question on Health Care Magic. I can understand your concern. By your history and description, possibility of musculoskeletal pain is more because your pain is associated with movements. But better to rule out heart and lung related causes first because you are having pigeon chest. So get done ecg to rule out cardiac diseases. Get done chest x ray to rule out Pulmonary causes. If both these are normal then no need to worry for major diseases. Musculoskeletal pain is more likely in your case. So avoid heavyweight lifting and strenuous exercise. Avoid movements causing pain. Avoid bad postures in sleep. Apply warm water pad on affected areas. Take painkiller and muscle relaxant drugs. 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.