Conversion Disorder — Mind versus Body: A Review, 2015, Ali et al

This is a 2015 paper. I think there has been some evolution on the thinking about whether a history of emotional trauma is necessary, or even if psychological conflict and repression of feelings is necessary. I think that evolution was necessary because studies just did not support those criteria in all of the people with functional disorder [add your favourite synonym] labels.

As to where that then leaves the functional disorder concept now, well, of course it's a mess. Basically it's the catch all for when doctors can't justify another label.

 

Oh, for sure, they have their cake, eat it too, and still manage to package it up and present it as a health food that's a gift to mankind...

It can be both life's stoics who can't complain even to themselves who are most at risk while at the same time it's the attention-seeker who is making a big deal about normal sensations that everyone experiences. It's people who are resilient and get on with things while lacking in self-efficacy. People who pay too much attention to their body while lacking in interoception. The contradictions are as frequent as the inane diagrams.

 

FND is just whatever its advocates want it to be at any given moment.

Nothing more, nothing less.