The pain in the lower left of his back has caused Murray discomfort since late 2011 and is the same injury which required a painkilling injection at last year's French Open.

CNN: Injured Murray to miss French Open?

The bullet went through his stomach and left him with weakened muscles on his right side and chronic back pain.

NPR: Wounded Soldier Fights for Health Benefits

President Kennedy left behind an upholstered rocking chair that he used to alleviate his chronic back pain.

WSJ: In the City's Power Suite