I would say to never assume something is psychosomatic, as for most people it usually is not. I had pain in my gut for years, and after the usual things being stuck into me with no results I assumed that it was Psycho, although I had no prior history of anything like this.
It is turned out, they had stuck a bunch of things into me, but not into the right places. When I finally got an accurate
diagnosis I was on my way to a healthy pain free life again.