You both might be right.

There is a theory that almost all people with a mental illness had some sort of trauma in their life. I think is likely true.

This post describes how trauma effects the brain and body:

The Body Keeps the Score (Part Two) ? how trauma changes us ? Beyond Meds

I says to me that the trauma is like if you have a wound and you don't cover it it can get infected leading to a blood disorder. But many uncovered wounds heal on their own too. Depends on many factors. I am not sure how that fits in with PTSD if that is the only diagnosis. It makes sense when talking about other disorders.

What I would like to see more information about is if the patient/therapist work on healing the trauma would symptoms of say, bipolar, go into a sort of remission? Qualifier... I am not sure I buy the idea that bipolar, MDD can't ever be healed. (Healed being different from cured)

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