Mostly truma : The most common cause of a fractured rib is a direct blow to the chest, often from a car accident or a fall. Coughing hard can also fracture a rib. This is more likely to happen if you have a disease that has made your bones weak, such as osteoporosis or cancer. It is important to see a doctor after a rib injury. A blow that is hard enough to fracture a rib could also injure your lungs.
Answered 11/24/2012
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