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What is Paranoid personality disorder and explain in detail?
Paranoid personality disorder (PPD) is a mental illness characterized by paranoid delusions, and a pervasive, long-standing suspiciousness and generalized mistrust of others. People with this personality disorder may be hypersensitive, easily insulted, and habitually relate to the world by vigilant scanning of the environment for clues or suggestions that may validate their fears or biases. They are eager observers. They think they are in danger and look for signs and threats of that danger, potentially not appreciating other interpretations or evidence.They tend to be guarded and suspicious and have quite constricted emotional lives. Their reduced capacity for meaningful emotional involvement and the general pattern of isolated withdrawal often lend a quality of schizoid isolation to their life experience. People with PPD may have a tendency to bear grudges, suspiciousness, tendency to interpret others actions as hostile, persistent tendency to self-reference, or a tenacious sense of personal right. Patients with this disorder can also have significant comorbidity with other personality disorders, such as schizotypal, schizoid, narcissistic, avoidant and borderline.

Causes
A genetic contribution to paranoid traits and a possible genetic link between this personality disorder and schizophrenia exist. A large long-term Norwegian twin study found paranoid personality disorder to be modestly heritable and to share a portion of its genetic and environmental risk factors with the other cluster A personality disorders, schizoid and schizotypal.Psychosocial theories implicate projection of negative internal feelings and parental modeling. Cognitive theorists believe the disorder to be a result of an underlying belief that other people are unfriendly in combination with a lack of self-awareness.

Diagnosis
ICD-10
The World Health Organizations ICD-10 lists paranoid personality disorder under (F60.0). It is a requirement of ICD-10 that a diagnosis of any specific personality disorder also satisfies a set of general personality disorder criteria. It is also pointed out that for different cultures it may be necessary to develop specific sets of criteria with regard to social norms, rules and other obligations.PPD is characterized by at least three of the following symptoms:

excessive sensitivity to setbacks and rebuffs;
tendency to bear grudges persistently (i.e. refusal to forgive insults and injuries or slights);
suspiciousness and a pervasive tendency to distort experience by misconstruing the neutral or friendly actions of others as hostile or contemptuous;
a combative and tenacious sense of self-righteousness out of keeping with the actual situation;
recurrent suspicions, without justification, regarding sexual fidelity of spouse or sexual partner;
tendency to experience excessive self-aggrandizing, manifest in a persistent self-referential attitude;
preoccupation with unsubstantiated "conspiratorial" explanations of events both immediate to the patient and in the world at large.Includes: expansive paranoid, fanatic, querulant and sensitive paranoid personality disorder.
Excludes: delusional disorder and schizophrenia.

DSM-5
The American Psychiatric Associations DSM-5 has similar criteria for paranoid personality disorder. They require in general the presence of lasting distrust and suspicion of others, interpreting their motives as malevolent, from an early adult age, occurring in a range of situations. Four of seven specific issues must be present, which include different types of suspicions or doubt (such as of being exploited, or that remarks have a subtle threatening meaning), in some cases regarding others in general or specifically friends or partners, and in some cases referring to a response of holding grudges or reacting angrily.PPD is characterized by a pervasive distrust and suspiciousness of others such that their motives are interpreted as malevolent, beginning by early adulthood and present in a variety of contexts. To qualify for a diagnosis, the patient must meet at least four out of the following criteria:
Suspects, without sufficient basis, that others are exploiting, harming, or deceiving them.
Is preoccupied with unjustified doubts about the loyalty or trustworthiness of friends or associates.
Is reluctant to confide in others because of unwarranted fear that the information will be used maliciously against them.
Reads hidden demeaning or threatening meanings into benign remarks or events.
Persistently bears grudges (i.e., is unforgiving of insults, injuries, or slights).
Perceives attacks on their character or reputation that are not apparent to others and is quick to react angrily or to counterattack.
Has recurrent suspicions, without justification, regarding fidelity of spouse or sexual partner.The DSM-5 lists paranoid personality disorder essentially unchanged from the DSM-IV-TR version and lists associated features that describe it in a more quotidian way. These features include suspiciousness, intimacy avoidance, hostility and unusual beliefs/experiences.

Other
Various researchers and clinicians may propose varieties and subsets or dimensions of personality related to the official diagnoses. Psychologist Theodore Millon has proposed five subtypes of paranoid personality:

Differential diagnosis
Paranoid personality disorder can involve, in response to stress, very brief psychotic episodes (lasting minutes to hours). The paranoid may also be at greater than average risk of experiencing major depressive disorder, agoraphobia, social anxiety disorder, obsessive-compulsive disorder and substance-related disorders. Criteria for other personality disorder diagnoses are commonly also met, such as: schizoid, schizotypal, narcissistic, avoidant, borderline and negativistic personality disorder.

Treatment
Because of reduced levels of trust, there can be challenges in treating PPD. However, psychotherapy, antidepressants, antipsychotics and anti-anxiety medications can play a role when a person is receptive to intervention.

Epidemiology
PPD occurs in about 0.5–4.4% of the general population. It is seen in 2–10% of psychiatric outpatients. In clinical samples men have higher rates, whereas epidemiologically there is a reported higher rate of women.

History
Paranoid personality disorder is listed in DSM-V and was included in all previous versions of the DSM. One of the earliest descriptions of the paranoid personality comes from the French psychiatrist Valentin Magnan who described a "fragile personality" that showed idiosyncratic thinking, hypochondriasis, undue sensitivity, referential thinking and suspiciousness.Closely related to this description is Emil Kraepelins description from 1905 of a pseudo-querulous personality who is "always on the alert to find grievance, but without delusions", vain, self-absorbed, sensitive, irritable, litigious, obstinate, and living at strife with the world. In 1921, he renamed the condition paranoid personality and described these people as distrustful, feeling unjustly treated and feeling subjected to hostility, interference and oppression. He also observed a contradiction in these personalities: on the one hand, they stubbornly hold on to their unusual ideas, on the other hand, they often accept every piece of gossip as the truth. Kraepelin also noted that paranoid personalities were often present in people who later developed paranoid psychosis. Subsequent writers also considered traits like suspiciousness and hostility to predispose people to developing delusional illnesses, particularly "late paraphrenias" of old age.Following Kraepelin, Eugen Bleuler described "contentious psychopathy" or "paranoid constitution" as displaying the characteristic triad of suspiciousness, grandiosity and feelings of persecution