Justin Bieber has announced he has Lyme disease. In a post to Instagram the pop superstar from Stratford, Ont., revealed that he had been “recently diagnosed” with Lyme disease. Lyme is a tick-borne bacteria that leads to flu-like symptoms and can spread within the body. Canadian singers Shania Twain and Avril Lavigne have also battled Lyme. Bieber also says he recently had a serious case of chronic mononucleosis, which affected his "skin, brain function, energy, and overall health." The 10-episode "Justin Bieber: Seasons" will follow Bieber while he records a new album, for which he recently released the single "Yummy."