Trevor Sweet had to be detained by security staff at South Tyneside District Hospital after refusing to leave the wards.
When police turned up, the 53-year-old swore at one of the officers and told him “I will fill you in.”
Sweet, of Trinity Walk, South Shields, was arrested for being drunk and disorderly, and admitted the offence at South Tyneside Magistrates’ Court.
Glenda Beck, prosecuting, said: “Police were called at 6.45pm on January 5.
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“The defendant was being aggressive and abusive.
“Police arrived and Sweet said: ‘I will fill you in as well’.
“He continued to be aggressive and abusive and was arrested.”
District Judge Helen Cousins fined Sweet £80 and told him; “This is worse because it was at a hospital.
“There are people there who need help and they don’t need to be bothered by people like you.”