: High levels of impulsivity (e.g., reckless driving, substance use), self-harm, and suicidal ideation.

is a condition defined by a persistent pattern of instability in emotions, identity, and relationships . While once reserved for adults, modern psychiatry recognizes that BPD often begins in childhood or early adolescence. Key Clinical Features

Clinicians identify BPD in teens through three primary dimensions of symptoms:

: Extreme emotional swings (affective instability) often triggered by minor events, intense or inappropriate anger, and chronic feelings of emptiness.

Borderline personality disorder: a comprehensive review of ... - PMC

: A desperate fear of abandonment , unstable relationships that swing between over-idealization and devaluation (splitting), and a shifting sense of self. Distinguishing BPD from "Normal" Teenage Behavior

Adolescence is naturally a time of moodiness and rebellion, but BPD features are distinguished by their .