I was in a car wreck 2 days ago. I didn't go to the hospital afterwards b/c no one was really injured. However, I did hit my left shoulder rather hard on the dashboard and have a substantial bruise because of this. Today i began feeling pain on the left side of my back under my shoulder blade when taking a deep breath in or when exhaling deeply. I was wondering if maybe i simply pulled a muscle or if this pain could be more serious and have to do with my left lung. If anyone has any ideas or think they could help me, your knowledge would be greatly appreciated!