Thanks for your question on Health Care Magic. I can understand your situation and problem. You are having blunt chest trauma 3 weeks back. Musculoskeletal pain is common after blunt chest trauma. So better to avoid movements causing pain. Avoid bad postures in sleep. Avoid strenuous exercise and heavyweight lifting. Avoid pressing chest. Start painkiller and muscle relaxant drugs. Apply warm water pad on affected areas. All these will give you symptomatic relief. If after 1-2 weeks, you still have pain than get done chest x ray to rule out internal damage. Don t worry, you will mostly improve with above mentioned things. Hope I have solved your query. Wish you good health. Thanks.