The parents can push all they want, if it isn't a real condition the doctors will not diagnose it as one.
Doctors/psychiatrist/psycologists want to advance their knowledge that is why they seek reasons. No different than finding out that women don't shrink as a by product of old age, there is a physical reason that can be put right.
Most doctors go into the field to advance human life, if they want to do the research they should, they know what they are talking about, will all due respect, very few on here do, to that extent.
Do you think medical advancement should stop? Why shouldn't we seek to make life better for those with MH/SN/Psychological conditions.