I don't like speaking broadly about 'psychosomatic' illness, and things like that don't seem impossible to me... but I have come to realise that my reasons for thinking such problems did occur were really all based on anecdotes in medical papers, and that there isn't really any more compelling evidence than that.
Over the years I felt it applied to my lower back inflammation, which flared under stress. Really it wasn't until the past year that I understood the connection of adrenals and low back flares. You could still call this psychosomatic in that emotional or psychological stress whack my adrenals, which then lead to a flare. (no longer, pretty much in the past). But the leap from psychological stress impacting adrenals to it's all in your mind is clearly an artifact of the anecdotal psychobabble.