If the chest is hit with no pain at first and then starts to hurt in a few days, if rib fracture and pneumothorax are excluded, conservative treatment can be carried out and close observation can be made. Chest pain is usually caused by soft tissue contusion, extrusion, or broken skin. In this case, you can use povidone-iodine for local disinfection, you can also use hot towels for external compresses, 2-3 times a day, each time 5-10 minutes. At the same time, pay attention to rest, do not do too much chest activity, avoid violent coughing to aggravate the pain. If the chest pain is caused by other conditions, it is recommended to go to the hospital for chest X-ray examination to clarify whether there is a fracture, whether there is a hemopneumothorax and other conditions, and then according to the cause of the treatment.