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Muhammad Ali’s health battle: What is Parkinson’s disease?

Jacque Wilson Smith
By Jacque Wilson Smith, CNN
4 minute read
Updated 5:08 PM EDT, Sat June 4, 2016
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Since winning a gold medal in the 1960 Olympics, Muhammad Ali has never been far from the public eye. Take a look at the life and career of Ali, the three-time heavyweight boxing champion who called himself "The Greatest."
Since winning a gold medal in the 1960 Olympics, Muhammad Ali has never been far from the public eye. Take a look at the life and career of Ali, the three-time heavyweight boxing champion who called himself "The Greatest."
Bob Gomel/The LIFE Picture Collection/Getty Images
Ali, then known as Cassius Clay, poses in his hometown of Louisville, Kentucky, prior to his amateur boxing debut in 1954. He was 12 years old and 85 pounds. As an amateur, he won 100 out of 108 fights.
Ali, then known as Cassius Clay, poses in his hometown of Louisville, Kentucky, prior to his amateur boxing debut in 1954. He was 12 years old and 85 pounds. As an amateur, he won 100 out of 108 fights.
AP
Ali rose to prominence at the 1960 Olympic Games in Rome, where he claimed a gold medal in the light-heavyweight division.
Ali rose to prominence at the 1960 Olympic Games in Rome, where he claimed a gold medal in the light-heavyweight division.
Central Press/Getty Images
Ali boldly predicted it would take him five rounds to knock out British boxer Henry Cooper ahead of their bout in London in 1963. The fight was stopped in the fifth round as Cooper was bleeding heavily from a cut around his eye.
Ali boldly predicted it would take him five rounds to knock out British boxer Henry Cooper ahead of their bout in London in 1963. The fight was stopped in the fifth round as Cooper was bleeding heavily from a cut around his eye.
Len Trievnor/Express/Getty Images
Patrick Power, 6, takes on Ali in the ring in 1963. Patrick was taking boxing lessons after getting bullied.
Patrick Power, 6, takes on Ali in the ring in 1963. Patrick was taking boxing lessons after getting bullied.
Keystone/Getty Images
Ali poses for a picture with The Beatles in Miami, during the run-up to his heavyweight title fight against Sonny Liston in 1964.
Ali poses for a picture with The Beatles in Miami, during the run-up to his heavyweight title fight against Sonny Liston in 1964.
Chris Smith/Popperfoto/Getty Images
Ali celebrates after defeating Liston in Miami on February 25, 1964. Upon becoming world heavyweight champion for the first time, Ali proclaimed, "I am the greatest!"
Ali celebrates after defeating Liston in Miami on February 25, 1964. Upon becoming world heavyweight champion for the first time, Ali proclaimed, "I am the greatest!"
Harry Benson/Express/Getty Images
Ali relaxes after his win over Liston in 1964. At 22, he became the youngest boxer to take the heavyweight title from a reigning champion.
Ali relaxes after his win over Liston in 1964. At 22, he became the youngest boxer to take the heavyweight title from a reigning champion.
Harry Benson/Express/Getty Images
Civil rights activist Malcolm X, left, takes a picture of a tuxedo-clad Ali surrounded by jubilant fans in March 1964. Shortly after the Liston fight, Ali announced that he had joined the Nation of Islam and changed his name from Cassius Clay.
Civil rights activist Malcolm X, left, takes a picture of a tuxedo-clad Ali surrounded by jubilant fans in March 1964. Shortly after the Liston fight, Ali announced that he had joined the Nation of Islam and changed his name from Cassius Clay.
Bob Gomel/The LIFE Images Collection/Getty Images
Known for being as quick with his mouth as he was with his hands, Ali often taunted his opponents. He famously said he could "float like a butterfly, sting like a bee."
Known for being as quick with his mouth as he was with his hands, Ali often taunted his opponents. He famously said he could "float like a butterfly, sting like a bee."
Harry Benson/Getty Images
Ali prepares to defend his heavyweight title in 1965.
Ali prepares to defend his heavyweight title in 1965.
Allsport/Hulton Archive/Getty Images
Ali stands over Liston during their rematch in Lewiston, Maine, on May 25, 1965.
Ali stands over Liston during their rematch in Lewiston, Maine, on May 25, 1965.
Neil Leifer/Sports Illustrated/Getty Images
Ali eats at a restaurant in 1965.
Ali eats at a restaurant in 1965.
Terry Fincher/Express/Getty Images
The referee pushes Ali to a neutral corner as Floyd Patterson slumps to the canvas in November 1965. The fight was stopped at the end of the 12th round and Ali was declared the winner.
The referee pushes Ali to a neutral corner as Floyd Patterson slumps to the canvas in November 1965. The fight was stopped at the end of the 12th round and Ali was declared the winner.
Allsport/Hulton Archive/Getty Images
Ali signs an autograph for a fan in 1966.
Ali signs an autograph for a fan in 1966.
Evening Standard/Getty Images
Ali visits a children's home in London in May 1966.
Ali visits a children's home in London in May 1966.
R. McPhedran/Express/Getty Images
Ali trains for his second fight against British champion Henry Cooper in May 1966.
Ali trains for his second fight against British champion Henry Cooper in May 1966.
R. McPhedran/Express/Getty Images