Let’s discuss what is illness vs. disease. There is a distinction that is being made in some medical circles (e.g., the treatment of pain) that, in my opinion, should be more widely known and circulated.The distinction hearkens back to a differentiation made by Eric Cassell in the late 1970’s: “Disease, then, is something an organ has, illness is something a man has.”According to this way of thinking, disease is something that needs to be cured, such as infection, injury, toxic exposure, cell degeneration, etc. Illness is something that needs to be managed such as feelings of pain, discomfort, distress, weakness, fatigue, etc.Obviously, these two things are not mutually exclusive, and they often occur together.