Complex post trauma stress disorder is a long term mental health condition which is often difficult and relatively expensive to treat and often requires several years of psychotherapy, modes of intervention and treatment by highly skilled, mental health professionals who specialize in trauma informed modalities designed to process and integrate childhood trauma memories for the purposes of mitigating symptoms and improving the survivors quality of life. Delaying therapy for people with complex PTSD, whether intentionally or not, can exacerbate the condition. Recommended treatment modalities and interventions
There is no one treatment which has been designed specifically for use with the adult complex PTSD population (with the exception of component based psychotherapy ) there are many therapeutic interventions used by mental health professionals to treat PTSD. As of February 2017, the American Psychological Association PTSD Guideline Development Panel (GDP) strongly recommends the following for the treatment of PTSD:
Cognitive behavioral therapy (CBT) and trauma focused CBT
Cognitive processing therapy (CPT)
Cognitive therapy (CT)
Prolonged exposure therapy (PE)The American Psychological Association also conditionally recommends
Brief eclectic psychotherapy (BEP)
Eye movement desensitization and reprocessing (EMDR) 
Narrative exposure therapy (NET)While these treatments have been recommended, there is still on-going debate regarding the best and most efficacious treatment for complex PTSD. Many commonly used treatments are considered complementary or alternative since there still is a lack of research to classify these approaches as evidenced based.
This symptom is neither included in the diagnosis of dissociative disorder nor in that of PTSD in the current DSM-5 (2013). Individuals with Complex PTSD also demonstrate lasting personality disturbances with a significant risk of revictimization.Six clusters of symptoms have been suggested for diagnosis of C-PTSD:
Alterations in regulation of affect and impulses
Alterations in attention or consciousness
Alterations in self-perception
Alterations in relations with others
Somatization
Alterations in systems of meaningExperiences in these areas may include:: 199–122 
Changes in emotional regulation, including experiences such as persistent dysphoria, chronic suicidal preoccupation, self-injury, explosive or extremely inhibited anger (may alternate), and compulsive or extremely inhibited sexuality (may alternate). Variations in consciousness, such as amnesia or improved recall for traumatic events, episodes of dissociation, depersonalization/derealization, and reliving experiences (either in the form of intrusive PTSD symptoms or in ruminative preoccupation). Changes in self-perception, such as a sense of helplessness or paralysis of initiative, shame, guilt and self-blame, a sense of defilement or stigma, and a sense of being completely different from other human beings (may include a sense of specialness, utter aloneness, a belief that no other person can understand, or a feeling of nonhuman identity). Varied changes in perception of the perpetrators, such as a preoccupation with the relationship with a perpetrator (including a preoccupation with revenge), an unrealistic attribution of total power to a perpetrator (though the individuals assessment may be more realistic than the clinicians), idealization or paradoxical gratitude, a sense of a special or supernatural relationship with a perpetrator, and acceptance of a perpetrators belief system or rationalizations.