Born in, County, Cahill first excelled at hurling in his youth. He first came to prominence on the inter-county scene when he first linked up with the minor team, before later joining the under-21 side. At club level Cahill is a four-time All-Ireland medallist with.
His retirement came following the conclusion of the 1997 championship.
Cahill"s brother, Adrian, also enjoyed an inter-county career with.
Birr All-Ireland Senior Club Hurling Championship (2): 1995, 1998 Leinster Senior Club Hurling Championship (6): 1991, 1994, 1997, 1999, 2001, 2002 Offaly Senior Club Hurling Championship (8): 1991, 1994, 1997, 1999, 2000, 2001, 2002, 2003 Offaly Leinster Under-21 Hurling Championship (1): 1989 All-Ireland Minor Hurling Championship (1): 1986 Leinster Minor Hurling Championship (1): 1986.
He made his senior debut during the 1988-1989 National League and immediately became a regular member of the team
