Nail biting can have various causes, just like most other symptoms. Finding the true cause means ruling out or confirming each possibility – in other words, diagnosis.
Diagnosis is usually a complex process due to the sheer number of possible causes and related symptoms. In order to diagnose nail biting, we could:
Do you bite your nails?
Possible responses:→ No / don't know
→ Sometimes a little, but my nails look quite normal
→ Moderately - they are bitten back to the nail bed
→ Severely - my nails are deformed or mostly gone
Nail biting can be a sign of persistent anxiety.
Nail biting or picking has been linked to obsessive-compulsive disorder.