In October 2014, local media reported that the Badminton Association of Malaysia has confirmed that one of the nation's top shuttlers has tested positive for dexamethasoneafter urine samples were taken during the World Championships in late August. The identity of the shuttler was not revealed but was widely believed to be Lee Chong Wei. Dexamathasone is not a performance-enhancing drug but a commonly-administered anti-inflammatory corticosteroid that is not illegal when used off-season for injury rehabilitation, but deemed illegal if discovered in an athlete's body during competition.

On 5 November 2014, Lee flew to Norway to witness the testing of his "B" sample at the Oslo University Hospital after the "A" sample had already been tested positive in October. The results were announced on 8 November 2014 by a Malaysian sports official who confirmed that the "B" sample had tested positive as well. He declined to identify the player but confirmed to The Associated Press that it was Lee.

On 11 November 2014, the Badminton World Federation confirmed that Lee is temporarily suspended from competing due to an apparent anti-doping regulation violation.The hearing was held on 11 April 2015 in Amsterdam.

On 27 April 2015, it was announced that Lee has been handed a backdated eight-month ban for his anti-doping rule violation. The panel was convinced that Lee had no intent to cheat and allowed him to resume his career by 1 May 2015. Lee was stripped of his silver medal from the 2014 World Championships but allowed to keep his two bronze medals from the 2014 Asian Games.

2015[edit]
Achievements[edit]
Doping[edit]
2014[edit]