Thanks for your question on Healthcare Magic. I can understand your concern. The way you are describing injury, possibility of rib fractures, lung contusion, pneumothorax is more likely. All these can cause similar symptoms. So better to get done chest x ray. If chest x ray is normal then no need to worry much. Tell that person to avoid heavyweight lifting and strenuous exercise, avoid movements causing pain. Apply warm water pad on affected areas of chest. He can take simple painkiller and muscle relaxant drugs like ibuprofen and thiocolchicoside. Hope I have solved your query. I will be happy to help you further. Wishing good health to that person. Thanks.