NSW man tasered after 'self-harming'

A man who allegedly tried to injure himself while talking to officers inside a northern NSW police station has been tasered.

It's alleged the 45-year-old pulled out a sharp object and began to injure himself after he walked into Newcastle Police Station on Thursday evening.

He was tasered and restrained immediately, police say.

The man was taken to John Hunter Hospital for surgery and remains in a stable condition.

A critical incident team from Tuggerah Lakes Local Area Command will now investigate the circumstances surrounding the incident, police said.