Could be one of many things. First of all you need to go to the doctor asap. That could be the difference from life or death. It could be your heart, a stroke
,lungs, torn muscle or ligaments, even stomach problems can send signals to your chest area as if it were chest pains. It could be nothing to worry about or it could be life threatening. Go see a doctor as soon as passable even if it's the emergency room. Good luck.