Career
Born in Bellshill, Lithgow began his professional career with Heart of Midlothian, joining from youth side East Kilbride Burgh in 2004. He made three appearances for Stirling Albion in a loan spell during the latter part of the 2007-2008 season. He was released by Hearts in August 2008.
He trained with Clyde, and appeared in reserve team matches, before signing a short term deal until the end of the year on 29 October 2008.
He made his Clyde debut in a 2–2 draw with Street Johnstone in November 2008. Lithgow"s contract was terminated in June 2009, following Clyde"s relegation and financial troubles, however, in July 2009, he signed a new one-month contract with the club
Following relegation to the Third Division, Lithgow turned down the offer of a new contract, and left the club in May 2010. Despite a trial with Greenock Morton Football Club, he was not offered a full-time contract and returned to Clyde for the 2010-2011 season.
He rejected the offer of a new contract in May 2011, and left the club again.
On 21 June 2011, Lithgow signed a contract with Dumbarton, in two seasons he made sixty-three league appearances and scored a total of five goals for the club In the summer of 2013 he signed for Ayr United. In 2014, Lithgow signed for Stenhousemuir, staying with the side for one season before joining Scottish League One rivals Airdrieonians in June 2015.