Over the past fews weeks I have been feeling pressure under my left rib cage (towards the side and front) and it hasnt cleared up as yet, its not that sore however I can feel the tenderness when I massage the area. I have also had a decline in energy over the past couple of weeks and feel a lot less energetic than I normal do. Im a very active fit person and this decrease is very noticable. My stool color has also change to a lighter color. I was wondering if anyone could tell me if they have had similar problems prior to me getting excited and going to the doctor. One person hinted to me that it maybe the signs of Mono.