There's not an accurate diagnosis to show you
Basic neurobiology isn't close to it

from Vinnie Paz (Ft. Yes Alexander) – Is Happiness Just a Word? Lyrics on Rap Genius

Meaning

Like most psychological disorders, DPD is poorely understood on a biological level. It is only diagnosed clinically, like through patients describing how they feel. They have yet to find any substantial physical or neurobiological evidence for this disorder.

Often this are under-diagnosed or mis-diagnosesd due to the lack of information about this disease and sufferers can be prescribed the wrong medications that will leave them just as bad.

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