Incurable diseases. I have multiple sclerosis and I hear a lot of things day to day like "You're just too dedicated to your diagnosis", or "have you tried the Wahls diet" or "have you taken magnesium supplements" or "you need to be more positive" or my favorite "It's OK, god has a plan".
Having experienced the actual thing degrading my brain for eight years, done high dose chemo and a bone marrow transplant, and poisoned my immune system over 200 separate times... I can definitively say that some processes (death, degenerative neurological diseases, autoimmunity, etc) are unavoidable and something people don't always actually have the power to beat regardless of the amount of positive thinking, dieting, or exercise one does.
EDIT: I just want to point out how multiple people have replied back to try to convince me that my condition is curable, or recommending treatments that I have already done and failed. Quite literally proving my point. 😆
EDIT: One person has interpreted my comments in this thread as me saying that any attempt to treat a chronic illness is hopeless or meaningless. This is not what I was intending to say (hopefully that is obvious). I am merely stating that many people have health conditions they can't fix or control despite best efforts, and that this experience is real and they deserve to have that experience respected.