Hello thank you for trusting HCM Dear you may have chest wall pain after a less serious injury. This pain can occur with movement of a shoulder, an arm, the rib cage, or the trunk of the body. Even a minor injury can cause chest pain for days after the injury. Deep breathing, coughing, or sneezing can increase the pain, as can pressing down on or lying on the injured area. Minor injuries often do not require a visit to a doctor. Home treatment can relieve the pain and discomfort. Even after a chest injury, it is important to determine whether your pain might be caused by a heart problem. If you do not have any symptoms of a heart attack or angina, your pain is probably caused by your chest injury. Rib fracture may cause pain on deep breathing and lie on injure area.if it is mild pain take painkillers (naprosyn,ibuprofen)with rest may relieve your symptoms. if it is severe pain you need to consult to your doctor as Early as possible. i think i answered to your question if you have more questions feel free to ask. take care