Emotion dysregulation, characterized by intense, poorly controlled, and rapidly changing emotions, is a core domain of dysregulation in Borderline Personality Disorder.

“the core domain of dysregulation that we see in borderline personality disorder is what we refer to as emotion dysregulation and this is largely defined by people's experience of emotions as feeling like um they have very intense emotions they don't feel like they can control their emotions very well their emotions change very rapidly so that's referred to as affective ability that the emotions will go from intense sadness to intense shame to fear to joy you know very quickly and seemingly without a lot of uh reason”