context: People with personality disorders have long-standing patterns of thinking and acting that differ from what society considers usual or normal. The inflexibility of their personality can cause great distress, and can interfere with many areas of life, including social and work functioning. People with personality disorders generally also have poor coping skills and difficulty forming healthy relationships. Unlike people with anxiety disorders, who know they have a problem but are unable to control it, people with personality disorders often are not aware that they have a problem and do not believe they have anything to control. Because they often do not believe they have a disorder, people with personality disorders often do not seek treatment. Schizoid personality disorder is one of a group of conditions called " Cluster ' A' " or eccentric personality disorders. People with these disorders often appear odd or peculiar. People with schizoid personality disorder also tend to be distant, detached, and indifferent to social relationships. They generally are loners who prefer solitary activities and rarely express strong emotion. Although their names sound alike and they might have some similar symptoms, schizoid personality disorder is not the same thing as schizophrenia. Many people with schizoid personality disorder are able to function fairly well, although they tend to choose jobs that allow them to work alone, such as night security officers, library, or lab workers. People with schizoid personality disorder often are reclusive, organizing their lives to avoid contact with other people. Many never marry or may continue to live with their parents as adults. Other common traits of people with this disorder include the following: They do not desire or enjoy close relationships, even with family members. They choose solitary jobs and activities. They take pleasure in few activities, including sex. They have no close friends, except first-degree relatives. They have difficulty relating to others. They are indifferent to praise or criticism. They are aloof and show little emotion. They might daydream and/or create vivid fantasies of complex inner lives. It is difficult to accurately assess the prevalence of this disorder, because people with schizoid personality disorder rarely seek treatment. Schizoid personality disorder affects men more often than women, and is more common in people who have close relatives with schizophrenia. Schizoid personality disorder usually begins in late adolescence or early adulthood. Little is known about the cause of schizoid personality disorder, but both genetics and environment are suspected to play a role. Some mental health professionals speculate that a bleak childhood where warmth and emotion were absent contributes to the development of the disorder. The higher risk for schizoid personality disorder in families of schizophrenics suggests that a genetic susceptibility for the disorder might be inherited. If symptoms of this personality disorder are present, the doctor will begin an evaluation by performing a complete medical history and possible physical exam. Although there are no lab tests to specifically diagnose personality disorders, the doctor might use various diagnostic tests to rule out physical illness as the cause of the symptoms. If the doctor finds no physical reason for the symptoms, he or she might refer the person to a psychiatrist or psychologist, health care professionals who are specially trained to diagnose and treat mental illnesses. Psychiatrists and psychologists use specially designed interview and assessment tools to evaluate a person for a personality disorder. People with this personality disorder rarely seek treatment, because their thoughts and behavior generally do not cause them distress. When treatment is sought, psychotherapy -- a form of counseling -- is the form of treatment most often used. Treatment likely will focus on increasing general coping skills, as well as on improving social interaction, communication, and self-esteem. Because trust is an important component of therapy, treatment can be challenging for the therapist, because people with schizoid personality disorder have difficulty forming relationships with others. Social skills training also can be an important component of treatment. Medication is generally not used to treat schizoid personality disorder itself. Drugs might, however, be prescribed if the person also suffers from an associated psychological problem, such as depression. A lack of social interaction is the main complication of schizoid personality disorder. People with this personality disorder are rarely violent, as they prefer not to interact with people. Co-occurring conditions such as mood disorders, anxiety disorders, and other personality disorders may also be more common than in the general population. Although some of their behaviors might be odd, people with schizoid personality disorder are generally able to function in everyday life. However, they might not form meaningful relationships or have families of their own. Studies have shown they may sometimes experience social, financial and work disability. There is no known way to prevent schizoid personality disorder.