jessriedel, the consensus is that this is a physiological disease with an unknown mechanism. That's why it's an area of active research.
I don't know where you get the idea that the null hypothesis for the cause of any set of symptoms not explained by known biomarkers needs to be "psychosomatic disorder". That's not even wrong - it makes no sense.
I don't know where you get the idea that the null hypothesis for the cause of any set of symptoms not explained by known biomarkers needs to be "psychosomatic disorder". That's not even wrong - it makes no sense.