Every morning when I wake up I have a sharp pain on my left side right under my chest in the ribcage area. It goes away when I turn onto my right side but if I breathe hard to cough it hurts a lot and if I go back onto my left side in bed. If I lay on my left side throughout the day it doesn't hurt. I also don't think its a ruptured spleen because I don't feel constant pain or have all the symptoms Does anyone know what's causing it?