Experts use 9 criteria to diagnose somebody with Narcissistic Personality Disorder (NPD).
The term narcissism is used a lot, and often incorrectly. It’s important to say this clearly: only a qualified professional can diagnose narcissistic personality disorder (NPD). You cannot diagnose your ex, and this article is not here to label anyone.
However, understanding the recognised traits can help you reflect on patterns of behaviour — and, more importantly, decide what you are willing to accept in a relationship.
The 9 Criteria of Narcissistic Personality Disorder
According to clinical guidelines, NPD is defined by a pattern of behaviours and traits. A person would typically need to show several of these consistently over time.
1. Grandiose Sense of Self-Importance
They may exaggerate achievements, expect recognition without matching effort or position themselves as more important than others.
2. Preoccupation with Success or Power
They often talk about success, status, wealth or influence. Their focus can feel more about image than substance.
3. Belief They Are “Special” or Superior
They may believe they should only associate with certain people or feel that others are beneath them.
4. Need for Excessive Admiration
They rely heavily on praise, attention or validation. Without it, their mood or behaviour can shift quickly.
5. Sense of Entitlement
They may expect special treatment or assume rules don’t apply to them. This can show up in subtle or obvious ways.
6. Exploitative Behaviour
They may use others to meet their own needs, whether emotionally, financially or socially, often without regard for the impact.
7. Lack of Empathy
They struggle to recognise or respond to the feelings of others. Your emotions may be dismissed, minimised or turned back on you.
8. Envy or Belief Others Envy Them
They may be openly envious of others or assume others are jealous of them, even without evidence.
9. Arrogant or Dismissive Attitude
Their communication can feel condescending, critical or superior, particularly when challenged.
It’s About Patterns, Not Moments
Everyone can show some of these traits at times.
What matters is the pattern:
- Is the behaviour consistent?
- Does it show up across different situations?
- Does it leave you feeling diminished, confused or drained?
One-off incidents are not the same as ongoing behaviour.
Why This Matters in Relationships
If you’ve experienced a relationship where these traits were present, you may have felt:
- Invalidated or unheard
- Constantly seeking approval
- Confused by mixed signals
- Emotionally exhausted
Over time, this can impact your confidence and sense of self.
The Real Question to Ask Yourself
Rather than focusing on whether someone “is a narcissist”, a more helpful question is:
How did this relationship make me feel — and is that something I want to accept again?
This shifts the focus back to you, where it belongs.
Final Thought
Understanding these traits isn’t about diagnosing someone else.
It’s about recognising patterns, trusting your experience and making clearer choices moving forward.
You deserve consistency, respect and emotional safety in your relationships — not confusion or self-doubt.
