borderline personality disorder
borderline personality disorder is a psychological condition marked by a prolonged disturbance of personality function, characterised by unusual variability and depth of moods. these moods may secondarily affect cognition and interpersonal relations. the disorder typically involves an unusual degree of instability in mood and black-and-white thinking, or splitting. BPD often manifests itself in idealisation and devaluation episodes and chaotic and unstable interpersonal relationships, issues with self-image, identity, and behaviour; as well as a disturbance in the individual’s sense of self. in extreme cases, this disturbance in the sense of self can lead to periods of dissociation.