My 21 year old grandson started having chest discomfort around 7pm last night, it gradually worsened, we took him to our local ER they did chest X-ray,lungs looked fine, but there was air bubble around the heart. Did ct scan to se if there was a tear in esophagus, no. Sent him home with Tylenol /code he said rest a couple days and should do better. What could have caused the air bubble? He did go sky diving six days prior.