"In this series, I dig a little deeper into the meaning of psychology-related terms… but not this week. Instead, we’ll take a look at ME/CFS, and why it’s absolutely not all in someone’s head." https://mentalhealthathome.org/2021/07/09/what-is-me-cfs/
The unspoken but implied message is “haul your head out of your arse.” It's not always unspoken and implied.