A BROKEN HEART (ALSO KNOWN AS A HEARTBREAK OR HEARTACHE) IS A TERM METAPHOR FOR THE INTENSE EMOTIONAL—AND SOMETIMES PHYSICAL—STRESS OR PAIN ONE FEELS AT EXPERIENCING GREAT LONGING. EMPTINESS AS A HUMAN CONDITION IS A SENSE OF GENERALIZED BOREDOM, SOCIAL ALIENATION AND APATHY. FEELINGS OF EMPTINESS OFTEN ACCOMPANY DYSTHYMIA, DEPRESSION, LONELINESS, ANHEDONIA, DESPAIR, OR OTHER MENTAL/EMOTIONAL DISORDERS, INCLUDING SCHIZOID PERSONALITY DISORDER, ATTENTION DEFICIT HYPERACTIVITY DISORDER, SCHIZOTYPAL PERSONALITY DISORDER AND BORDERLINE PERSONALITY DISORDER