Gallagher made his professional debut in September 1993 with a Technical Knockout (TKO) win over John Kelly at the York Hall in Bethnal Green.
He compiled an unbeaten ledger of 13-0 (7 KO) with wins over the likes of Chris Clarkson, Marco Fattore and Marc Smith before getting a crack at the vacant Southern Area title in November 1995.
In what was voted the BBB&C fight of the year for 1996 ended in Gallagher winning a split decision and bringing his record to 17-0 (9 KO).
After seeking medical help, PJ Pat Gallagher was suffering from low testosterone levels which made him feel weak, unfit.
Over 6x3 Gallagher won on all scorecards and waved goodbye to his fans as he announced his retirement from the sport and finished with a professional record of 19-1 (9KO).