The unique collection of ways a person thinks, feels and behaves makes up their personality. It has usually developed by the late teens or early twenties and in most cases, individuals’ personality is adaptive, allowing them to learn pro-social ways to get on reasonably well with others.
For some people, however, patterns of thinking, feeling and behaving (often called personality ‘traits’) are established that remain longstanding, persistent and pervasive, and can make them experience significant problems in their life. They have difficulties establishing or maintaining relationships, getting on with friends, family or work colleagues, controlling their emotions and behavior, or learning from experience. As a result they can feel unhappy and distressed and/or find that they often upset or harm other people. In these circumstances, their personality structure may amount to disorder
There are several different subtypes of personality disorder, but broadly they tend to fall into three groups or ‘clusters’, according to their emotional ‘flavour’:
Cluster A personalities are suspicious or eccentric. Paranoid personality disordered individuals have a tendency to be suspicious of others, to hold grudges, to feel easily rejected and to think others are being nasty (even when evidence does not support this). Schizoids have a tendency to be emotionally cold or aloof, to dislike contact with others, to prefer their own company and to have a rich ‘fantasy’ world. Schizotypal PDs have a tendency to have odd ideas and to display eccentric behaviour, to exhibit a lack of emotion or inappropriate emotional reactions and to see or hear strange things (this may be related to the mental illness schizophrenia).
Cluster B personalities are dramatic, emotional or erratic. Dissocial (also called antisocial) personalities demonstrate a tendency to have little consideration for the feelings of others, to get easily frustrated, to be aggressive and engage in criminal behaviour, to be impulsive, to find it difficult to learn from experience and to not experience guilt or remorse. Emotionally Unstable (borderline or impulsive) show a tendency to be impulsive, to have difficulties controlling emotions, to feel ‘empty’, to have low self-esteem, to self harm or make repeated suicide attempts, to establish relationships quickly but easily lose them, to feel paranoid or depressed and to sometimes hear ‘voices’, especially when stressed. Histrionic personalities have a tendency to be self-centered and to over-dramatise events, to be easily suggestible, to worry excessively about appearance, to crave drama and excitement and to experience rapidly shifting emotions. Narcissistic individuals show a tendency to feel very self-important, to harbour dreams of unlimited power, success and intellectual brilliance, to crave attention and/or to ask favours from others but rarely reciprocate, and a tendency to exploit others.
Cluster C personalities are anxious and fearful. Anxious (avoidant) individuals demonstrate a tendency to feel near continuous anxiety and tension, to worry excessively, to feel insecure and inferior, to be very sensitive to criticism and to have an overwhelming need to be accepted and liked. Dependent personality disordered patients have a tendency to be passive and overly-reliant on others to make decisions, to feel hopeless and incompetent, to feel ‘abandoned’ by others and to experience difficulties coping with daily chores. Obsessive-compulsive (anankastic) individuals show a tendency to be perfectionistic, to experience excessive worry and doubt, to be preoccupied with minutiae, extremely cautious, to worry about doing the ‘wrong’ thing, to have high moral standards, to be judgmental, very sensitive to criticism and to have difficulty adapting to new/unfamiliar situations.
The prevalence of personality disorder is estimated to be about 1 in 10, with particular subtypes being more common in men (eg. dissocial) and women (eg. emotionally unstable). People with personality disorder also seem to be more likely to suffer from other mental health problems such as depression or alcohol or drug problems.
The exact cause of personality disorders is not known but a number of factors have been identified as likely contributors to the development of personality disorder. Some people with personality disorder have experienced physical and/or sexual abuse in childhood (especially emotionally unstable personality disorder), familial violence, or may have parents who drank alcohol excessively. Some evidence suggests that particular personality disorders occur more often in families where family members suffer from other mental health problems (for example schizotypal personality disorder in families where schizophrenia occurs)
Some personality disorders can develop after brain injury. Recently, evidence has also emerged that the brains of people with antisocial personality disorder have very slight structural differences when compared to the brains of people without personality disorder.
Treatment for people with personality disorder generally involves psychological therapies and less often medication. The type of therapy offered will usually depend on preferences of the sufferer, the particular difficulties they have, and sometimes, what treatments are available in a particular area. These can be offered either on a one to one and/or a group basis. Specific types of psychological treatments include Mentalisation, Dialectical Behaviour Therapy (DBT), Cognitive Therapy, Schema Focused Therapy, Cognitive Analytical Therapy (CAT) and Dynamic Psychotherapy.
Antipsychotic medications can usually be prescribed in low doses to help with suspiciousness in the Cluster A personality disorders and with paranoid feelings and hearing ‘voices’ in Emotionally Unstable personality disorder. Antidepressants may help with mood instability, emotional difficulties, impulsivity and aggression in people with Cluster B personality disorders and can also reduce anxiety in those with Cluster C personality disorders. Mood-stabilisers can also help with rapidly fluctuating moods and can reduce impulsivity and aggression.