This morning when I got to work all of a sudden I got a dull sharp pain on the left upper side, right under the rib cage area more toward the back. It has been constant now for a couple of hours. It feels better if I put pressure on it, but that is about it. Moving, sitting, standing, stretching, there is no change in the pain. Not quite sure what caused it to start as I haven't hit it or doing any kind of heavy lifting or anything that I could think to cause pain. I'm female and 21 years old. Any idea what this could be and if I should be seeking medical attention?