Hogan was reportedly found in his Florida home.
There were many police cars and ambulances parked outside Hogan's house, and the man was carried out on a stretcher and loaded into an ambulance.
Just a few weeks ago, Hogan's wife Sky denied rumors that he was in a coma, saying his heart was"strong" as he recovered from surgeries.
Hogan fundamentally changed the world of professional wrestling, turning the sport into a family entertainment.
Before him, wrestling was aimed at a relatively small audience. Hogan's in-ring theatrics attracted children and their parents, essentially taking the sport to a new level.
The Hulkamania cult began in 1984, when Hogan defeated wrestler Iron Sheik to win the world heavyweight championship.
His signature bandana and mustache became distinctive accents that were imitated by fans around the world for decades.
In 1996, Hogan changed his image from hero to villain. He founded the group NWO (New World Order) and became the Hollywood Hulk Hogan, which further popularized both him and professional wrestling.
Hogan was inducted into the WWE Hall of Fame in 2005, but his name was removed in 2015 after a scandal erupted over racist comments secretly recorded during an intimate encounter.
Hogan sued Gawker, which published the video, won the case, and was inducted into the WWE Hall of Fame for the second time, this time as a member of the NWO.