[naasking]

That it's psychogenic doesn't mean they're imagining it, or even that it's not physical. The brain is a physical organ that is responsible for regulating bodily processes after all. Mental processes have direct and obvious physical effects on other organs, so of course they can also have subtler dysregulatory effects as well.

Sometimes the cause or treatment might be physical, sometimes it might be mental, because the mental intervention might be just as effective, even with our current poor understanding of the brain.