What qualifies as emotional instability?

What is emotional instability? Emotional instability presents with a changeable mood. You could be feeling happy and energetic one minute, but then small things like a comment made by someone or something not going as planned can result in a sudden, and sometimes quite catastrophic, drop in mood.

What are unstable emotions?

Emotionally unstable personality disorder, EUPD, or Borderline Personality Disorder as it is also called, describes the problems you experience if you are emotionally unstable, anxiety-ridden and have a pattern of self-destructive behaviour.