occasionally I have a very sharp stabbing pain on the left or right side of my ribs. It feels like some one has stabbed me and left the knife in between my ribs. It is often so pain full that I can't take a deep breath, and I can barley take any breath. I am often sitting sown when this happens.

The pain will often go away in 3 or so min. but some times it takes longer.

Does any one know what this is?