I slipped on hydrolic fluid hit on my back more on the left side. I heard popping in my chest it took my breath away. That was 10 days ago. It hurts to take full air into lungs. I has ex-rays no broke or fractured ribs. When I cough it feels like a knife right under shoulder blade and also two inches under my left nipple. It is very sharp pain. I almost passout when I cough and there is popping inside my chest from front all around to the back. All pain is in rib 4 and 5 area in the front. and again under shoulder blade close to spine.