> The fact that something is "all in your head" doesn't imply much about how much control you might have over it. Schizophrenia is "all in your head." So is a

> The fact that something is "all in your head" doesn't imply much about how much control you might have over it. Schizophrenia is "all in your head." So is a brain tumor or glaucoma, in a literal sense, but I doubt many people would seriously use the expression "all in your head" for any of those. In my experience it's overwhelmingly used for anxiety and depression, with the implication being that there's no hard physical problem and that you just need to change your habits/attitude/beliefs (which, incidentally, is an approach that is notably ineffective for schizophrenia, apart from being done with others as a harm reduction mechanism).