Chapter Text
Dissociative Identity Disorder is caused by trauma ,usually in the prepubescent or adolescent years, that causes a fracture of the psyche. The trauma can be over an extended period of time or a one time incident, however is seen significantly more in those that suffer long term abuse during childhood. Symptoms range from memory gaps to normal failure in attention and so is sometimes hard to diagnose. The main component of D.I.D. is the existence of at least two distinct 'personalities' or presenting two separate ANP or EP's. Problems from DID usually arise from comorbidities and/or the dissociation leaving them unable to remember specific information as well as gaps in memory.
This is the textbook dry version of what we know of DID which hasn't even been called that for very long. It used to just be called split personality disorder and only be known at its extremes when it was witnessed someone shifted during extreme stress or traumatic events until more research was done revealing that this was not the full extent of the illness and so had to be changed to be more encompassing.
The reality of someone with DID is that they may not even know.