Hey everybody, Recently I noticed that I am able to palpate a mass under my right rib. It is strange though that I can only feel it when I am standing but when I lay down (they way a doctor would examine a patient's belly), I cannot touch it anymore. What could be that? Can it be my liver or colon? It seems to be taking a relatively big area so it is not just a one spot. Any information will be much appreciated as I am stressed out because of this.