Your kidneys a filter organ. To dream of a kidney represents filtering some aspect of your life. Either you are currently filtering – as in an aspect of your life or your personality, or you desire to filter yourself more. A kidney that is not functioning properly indicates that your filtering system isn’t working properly – you feel you share too much or too little of yourself to others. If your kidney is functioning normally, it indicates that you filter yourself in a way that you feel is appropriate given the situation.