How does PTS relate to Multiple Personalitites?

Everyone reacts to trauma differently and when it's not dealt with, can manifest physically or psychologically differently. If a person has suffered multiple traumas, well, it's like when a trauma happens, whoever you are at that moment gets buried deep down and its covered, to protect that part of the self from further harm. Your essence fragments and when that person gets to a stage in her life that she can deal with a trauma that happened say in childhood, that part of herself, say her 8 year old self, emerges and can manifest as a separate personality is some cases, especially if the patient doesn't consciously remember the trauma.

Similar causation. And they are often co-morbid. Or rather, PTSD is the most commonly diaganosed co-morbid disorder in people with DID (though obviously given the rareness of DID, not the other way round)

Multiple Personalities (or Dissociative Identities Disorder (DID)) is caused by a traumatic life experience, usually in early childhood, where the person dissociates in order to cope. Post Traumatic Stress disorder is caused by a traumatic life experience (often later in life, no dissociation necessary)... And often, the same theraputic technique is used for both disorders (i.e. encouraging them to think back to the traumatic experience)

I suppose it is possible for the two to be comorbid disorders, though that's fairly unlikely. In both disorders - PTSD and DID - certain episodes can be triggered by high levels of stress. For example, high stress can set off flashbacks for an individual with PTSD. I think that is the most that they have in common.

the way my therapist tells me is, PTSD has a lot of inpact on your body and so your body trys to work in other ways. Like i have ptsd and aslo i have bpd. They are related together. I understanded where you are coming from, ptsd is very hard but to have the other on top of it. but to my guess your body is acting out in other ways, that is why you have the other illness. I know it is hard hun and you feel like it is never going to get better. At lest that is how i feel. hang in there hun. i hope this helps.