We all as a human meet variety of people in our life and we definitely observe and sense people around us. Many times we are unable to understand the responses that person express and we are unable to establish a rapport with other person. Out of 5 there are 4 persons who may go through Personality issues or personality Disorders. But we are not aware about what personality disorders are .Following is the definition of Personality disorder......

"a deeply ingrained and maladaptive pattern of behaviour of a specified kind, typically apparent by the time of adolescence, causing long-term difficulties in personal relationships or in functioning in society".

Personality disorders are a class of mental disorders characterized by enduring maladaptive patterns of behavior, cognition, and inner experience, exhibited across many contexts and deviating markedly from those accepted by the individual's culture. These patterns develop early, are inflexible, and are associated with significant distress or disability. The definitions may vary somewhat, according to source

Personality disorders are characterized by an enduring collection of behavioral patterns often associated with considerable personal, social, and occupational disruption. What's more, personality disorders are inflexible and pervasive across many situations, due in large part to the fact that such behavior may be ego-syntonic (i.e. the patterns are consistent with the ego integrity of the individual) and are, therefore, perceived to be appropriate by that individual. This behavior can result in maladaptive coping skills, which may lead to personal problems that induce extreme anxiety, distress, or depression These patterns of behavior typically are recognized in adolescence and the beginning of adulthood and, in some unusual instances, childhood.