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

By Jacque Wilson Smith, CNN

Updated 2108 GMT (0508 HKT) 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."
Photos: Boxing legend Muhammad Ali
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."
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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.
Photos: Boxing legend Muhammad Ali
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.
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Ali rose to prominence at the 1960 Olympic Games in Rome, where he claimed a gold medal in the light-heavyweight division.
Photos: Boxing legend Muhammad Ali
Ali rose to prominence at the 1960 Olympic Games in Rome, where he claimed a gold medal in the light-heavyweight division.