The Full Form of HPD is Histrionic personality disorder.

Histrionic personality disorder (HPD) is defined by the American Psychiatric Association as a personality disorder characterized by a pattern of excessive attention-seeking behaviors, usually beginning in early childhood, including inappropriate seduction and an excessive desire for approval. People diagnosed with the disorder are said to be lively, dramatic, vivacious, enthusiastic, and flirtatious. HPD is diagnosed four times as frequently in women as men. It affects 2–3% of the general population and 10–15% in inpatient and outpatient mental health institutions.

HPD lies in the dramatic cluster of personality disorders. People with HPD have a high desire for attention, make loud and inappropriate appearances, exaggerate their behaviors and emotions, and crave stimulation. They may exhibit sexually provocative behavior, express strong emotions with an impressionistic style, and can be easily influenced by others. Associated features include egocentrism, self-indulgence, continuous longing for appreciation, and persistent manipulative behavior to achieve their own needs.