Depersonalization

depersonalisationdepersonalizeddepersonalisedDepersonalization disorderself-alienation
Depersonalization can consist of a detachment within the self, regarding one's mind or body, or being a detached observer of oneself.wikipedia
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Derealization

derealisationunrealityFeeling unreal
Though degrees of depersonalization and derealization can happen to anyone who is subject to temporary anxiety or stress, chronic depersonalization is more related to individuals who have experienced a severe trauma or prolonged stress/anxiety.
Derealization is a subjective experience of unreality of the outside world, while depersonalization is sense of unreality in one's personal self, although most authors currently do not regard derealization (surroundings) and depersonalization (self) as separate constructs.

Schizoid personality disorder

schizoidschizoid personalitySchizoids
It is also a prominent symptom in some other non-dissociative disorders, such as anxiety disorders, clinical depression, bipolar disorder, schizophrenia, schizoid personality disorder, hypothyroidism or endocrine disorders, schizotypal personality disorder, borderline personality disorder, obsessive-compulsive disorder, migraines, and sleep deprivation; it can also be a symptom of some types of neurological seizure.
These feelings may lead to depression or depersonalisation.

Self

self-interestselvesselfhood
Also, a recognition of a self breaks down (hence the name).
Examples of psychiatric conditions where such 'sameness' is broken include depersonalization, which sometimes occur in schizophrenia: the self appears different from the subject.

Dissociative identity disorder

multiple personality disordermultiple personalitiessplit personality
Depersonalization-derealization is the single most important symptom in the spectrum of dissociative disorders, including dissociative identity disorder and "dissociative disorder not otherwise specified" (DD-NOS).
The DSM-IV-TR criteria for DID have been criticized for failing to capture the clinical complexity of DID, lacking usefulness in diagnosing individuals with DID (for instance, by focusing on the two least frequent and most subtle symptoms of DID) producing a high rate of false negatives and an excessive number of DDNOS diagnoses, for excluding possession (seen as a cross-cultural form of DID), and for including only two "core" symptoms of DID (amnesia and self-alteration) while failing to discuss hallucinations, trance-like states, somatoform, depersonalization, and derealization symptoms.

Schizotypal personality disorder

schizotypalschizotypal disorderschizotypal personality
It is also a prominent symptom in some other non-dissociative disorders, such as anxiety disorders, clinical depression, bipolar disorder, schizophrenia, schizoid personality disorder, hypothyroidism or endocrine disorders, schizotypal personality disorder, borderline personality disorder, obsessive-compulsive disorder, migraines, and sleep deprivation; it can also be a symptom of some types of neurological seizure.

Self-categorization theory

meta-theoretical debatepsychologically identifiessalient group memberships
In social psychology, and in particular self-categorization theory, the term depersonalization has a different meaning and refers to "the stereotypical perception of the self as an example of some defining social category".
Further, although the term depersonalization has been used in clinical psychology to describe a type of disordered experience, this is completely different from depersonalization in the sense intended by self-categorization theory authors.

Interoceptive exposure

Interoceptive exposure is a non-pharmacological method that can be used to induce depersonalization.
Interoceptive exposure can be used as a means to induce depersonalization and derealization.

Benzodiazepine dependence

dependencean addiction to the sleeping drug BenzodiazepineBarbiturate type dependence
Benzodiazepine dependence, which can occur with long-term use of benzodiazepines, can induce chronic depersonalization symptomatology and perceptual disturbances in some people, even in those who are taking a stable daily dosage, and it can also become a protracted feature of the benzodiazepine withdrawal syndrome.
Some withdrawal symptoms that may appear include anxiety, depressed mood, depersonalisation, derealisation, sleep disturbance, hypersensitivity to touch and pain, tremor, shakiness, muscular aches, pains, twitches, and headache.

Cannabis (drug)

marijuanacannabispot
It is an effect of dissociatives and psychedelics, as well as a possible side effect of caffeine, alcohol, amphetamine, and cannabis.
In some cases, cannabis can lead to dissociative states such as depersonalization and derealization.

Self-disorder

self-disordersanomalous self-experienceDistortions of self-experience
A similar and overlapping concept called ipseity disturbance (ipse is Latin for "self" or "itself" ) may be part of the core process of schizophrenia spectrum disorders.

Depersonalization disorder

Depersonalisation disorderDepersonalization syndromedepersonalisation/derealisation disorder
Chronic depersonalization refers to depersonalization-derealization disorder, which is classified by the DSM-5 as a dissociative disorder.
Depersonalization disorder (DPD), also known as depersonalization/derealization disorder (DPDR), is a mental disorder in which the person has persistent or recurrent feelings of depersonalization or derealization.

Dissociative

dissociative anestheticdissociativesDissociative drug
It is an effect of dissociatives and psychedelics, as well as a possible side effect of caffeine, alcohol, amphetamine, and cannabis.
Perhaps the most significant subjective differences between dissociatives and the classical hallucinogens (such as LSD and mescaline) are the dissociative effects, including: depersonalization, the feeling of being unreal, disconnected from one's self, or unable to control one's actions; and derealization, the feeling that the outside world is unreal or that one is dreaming.

Psychedelic drug

psychedelicpsychedelicspsychedelic drugs
It is an effect of dissociatives and psychedelics, as well as a possible side effect of caffeine, alcohol, amphetamine, and cannabis.
The main differences between dissociative psychedelics and serotonergic hallucinogens are that the dissociatives cause more intense derealization and depersonalization.

Empathy

empathicempathempathetic
Lieutenant Colonel Dave Grossman, in his book On Killing, suggests that military training artificially creates depersonalization in soldiers, suppressing empathy and making it easier for them to kill other human beings.
Atypical empathic responses have been associated with autism and particular personality disorders such as psychopathy, borderline, narcissistic, and schizoid personality disorders; conduct disorder; schizophrenia; bipolar disorder; and depersonalization.

DSM-5

DSM-Vmental health disordersDiagnostic and Statistical Manual of Mental Disorders
Chronic depersonalization refers to depersonalization-derealization disorder, which is classified by the DSM-5 as a dissociative disorder.

Dissociative disorder

dissociative disordersdissociativedisassociative disorder
Chronic depersonalization refers to depersonalization-derealization disorder, which is classified by the DSM-5 as a dissociative disorder.

Psychological trauma

traumatraumatizedtraumatic
Though degrees of depersonalization and derealization can happen to anyone who is subject to temporary anxiety or stress, chronic depersonalization is more related to individuals who have experienced a severe trauma or prolonged stress/anxiety.

Dissociative disorder not otherwise specified

DDNOSOther Specified Dissociative Disorder
Depersonalization-derealization is the single most important symptom in the spectrum of dissociative disorders, including dissociative identity disorder and "dissociative disorder not otherwise specified" (DD-NOS).

Anxiety disorder

anxiety disordersanxietynervous disorder
It is also a prominent symptom in some other non-dissociative disorders, such as anxiety disorders, clinical depression, bipolar disorder, schizophrenia, schizoid personality disorder, hypothyroidism or endocrine disorders, schizotypal personality disorder, borderline personality disorder, obsessive-compulsive disorder, migraines, and sleep deprivation; it can also be a symptom of some types of neurological seizure.

Major depressive disorder

depressionclinical depressionmajor depression
It is also a prominent symptom in some other non-dissociative disorders, such as anxiety disorders, clinical depression, bipolar disorder, schizophrenia, schizoid personality disorder, hypothyroidism or endocrine disorders, schizotypal personality disorder, borderline personality disorder, obsessive-compulsive disorder, migraines, and sleep deprivation; it can also be a symptom of some types of neurological seizure.

Bipolar disorder

bipolarmanic depressionmanic depressive
It is also a prominent symptom in some other non-dissociative disorders, such as anxiety disorders, clinical depression, bipolar disorder, schizophrenia, schizoid personality disorder, hypothyroidism or endocrine disorders, schizotypal personality disorder, borderline personality disorder, obsessive-compulsive disorder, migraines, and sleep deprivation; it can also be a symptom of some types of neurological seizure.

Schizophrenia

schizophrenicschizophrenicspositive symptoms
It is also a prominent symptom in some other non-dissociative disorders, such as anxiety disorders, clinical depression, bipolar disorder, schizophrenia, schizoid personality disorder, hypothyroidism or endocrine disorders, schizotypal personality disorder, borderline personality disorder, obsessive-compulsive disorder, migraines, and sleep deprivation; it can also be a symptom of some types of neurological seizure. A similar and overlapping concept called ipseity disturbance (ipse is Latin for "self" or "itself" ) may be part of the core process of schizophrenia spectrum disorders.

Hypothyroidism

hypothyroidhypo-underactive thyroid
It is also a prominent symptom in some other non-dissociative disorders, such as anxiety disorders, clinical depression, bipolar disorder, schizophrenia, schizoid personality disorder, hypothyroidism or endocrine disorders, schizotypal personality disorder, borderline personality disorder, obsessive-compulsive disorder, migraines, and sleep deprivation; it can also be a symptom of some types of neurological seizure.

Borderline personality disorder

borderlineborderline personalityemotional instability
It is also a prominent symptom in some other non-dissociative disorders, such as anxiety disorders, clinical depression, bipolar disorder, schizophrenia, schizoid personality disorder, hypothyroidism or endocrine disorders, schizotypal personality disorder, borderline personality disorder, obsessive-compulsive disorder, migraines, and sleep deprivation; it can also be a symptom of some types of neurological seizure.

Obsessive–compulsive disorder

obsessive-compulsive disorderobsessive compulsive disorderOCD
It is also a prominent symptom in some other non-dissociative disorders, such as anxiety disorders, clinical depression, bipolar disorder, schizophrenia, schizoid personality disorder, hypothyroidism or endocrine disorders, schizotypal personality disorder, borderline personality disorder, obsessive-compulsive disorder, migraines, and sleep deprivation; it can also be a symptom of some types of neurological seizure.