A 16 year old girl has cut her wrists more than once, often after small fights at home, and also shows big mood swings and a long pattern of rocky relationships. The question asks which diagnosis fits this picture best.
- Borderline personality disorder: Marked by repeated impulsive self-harm, sharp mood swings, and a lasting pattern of unstable relationships, which is exactly what is described here.
- Major depression: Usually causes a suicide attempt during a low mood episode, but does not by itself explain a repeated pattern of self-harm set off by minor quarrels, or ongoing relationship instability.
- Histrionic personality disorder: Centres on being overly dramatic and craving attention, not on repeated cutting behaviour and unstable relationships.
- Adjustment disorder: A reaction limited to one clear stressor over a short time, not a long repeating pattern seen across many episodes.
The repeated wrist-slashing tied to trivial conflicts, along with mood instability and unstable relationships that run through her life, are the hallmark triad of borderline personality disorder.
Let's summarize:
- Recurrent impulsive self-harm is a core feature of borderline personality disorder.
- Unstable mood and unstable relationships that persist over time support this diagnosis over a single depressive episode.
- Histrionic personality disorder and adjustment disorder do not match the repeated self-harm pattern described.
So the correct answer is borderline personality disorder.