Thanks for your question on Health Care Magic. I can understand your son s situation and problem. He is having blunt chest trauma. Musculoskeletal injury is common after such trauma. But since he is having slight difficulty in breathing and sharp chest pain, better to get done chest x ray to rule out internal lung injury like pneumothorax, Pulmonary contusions, fracture etc. If chest x ray is normal than no need to worry much for this. He is having simple musculoskeletal pain. Ask him to avoid heavyweight lifting and strenuous exercise. Avoid movements causing pain. Take painkiller and muscle relaxant drugs. Application of warm water pad on affected areas is also helpful. Don t worry, he will be alright but first get done chest x ray. Hope I have solved your query. Wishing good health to your son. Thanks.