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

By Jacque Wilson Smith, CNN

Updated 2108 GMT (0508 HKT) June 4, 2016

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.
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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.
Photos: Boxing legend Muhammad Ali
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.
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Patrick Power, 6, takes on Ali in the ring in 1963. Patrick was taking boxing lessons after getting bullied.