Attachment disorder is the inability to form loving and lasting relationships, to give or receive love or affection, form a conscience, or trust others. Attachment difficulties are on a continuum of disturbance that range from attachment issues all the way to attachment disorder. Attachment disorder falls under many names and categories. In children, these names include: Reactive attachment disorder or RAD Oppositional defiant disorder Post-traumatic stress disorder Childhood trauma PDD Pervasive development delay In adults, these names include: Borderline personality Histrionic personality Antisocial personality Narcissistic personality Dependent personality Obsessive-compulsive disorder