What is the person with these symptoms suffering from? Outbursts of emotions, unpredictable moods, quarrelsome behaviour, conflicts with others

The correct option is Borderline personality disorder (BPD).

Borderline Personality Disorder (BPD) is a mental health condition characterized by significant difficulties in regulating emotion. This lack of emotional control leads to severe instability in mood, self-image, and interpersonal relationships.

Let us break down why the symptoms described in the question point directly to Borderline Personality Disorder:
1. Outbursts of emotions & unpredictable moods: Individuals with BPD experience intense episodes of anger, depression, and anxiety that can last from a few hours to a few days. These rapid, unpredictable shifts in mood are a core feature of affective (emotional) instability.
2. Quarrelsome behaviour & conflicts with others: A hallmark of BPD is a pattern of unstable and intense relationships. People with BPD often view things in extremes (e.g., all good or all bad, a phenomenon known as "splitting"). This makes them highly sensitive to perceived rejection or abandonment, frequently triggering misunderstandings, impulsive reactions, quarrelsome behavior, and ongoing conflicts with family, friends, and peers.

In contrast, mood disorders typically involve sustained periods of depression or mania rather than rapid, personality-driven interpersonal conflicts; addictive disorders center around substance abuse; and schizophrenia is primarily characterized by psychosis, delusions, and hallucinations.