Borderline personality disorder (BPD) is a complex condition. It affects how a person feels about themselves and others. BPD is characterized by intense, unstable emotions and relationships as well as insecurity and self-doubt.

BPD makes everything about a person feel unstable, ranging from moods, thinking, behavior, relationships, and sometimes identity. People with this condition have described BPD as the feeling of having an exposed nerve ending, essentially leaving someone to be easily triggered by small things.