According to an August 2008 article Phelps does not have Marfans Syndrome. Tests cleared Phelps of Marfan syndrome at the time, but doctors have urged vigilance and the American star still undergoes annual check-ups for the disease.
Here is a link to full article: http://www.theage.com.au/news/swimming/does-a-genetic-flaw-make-phelps-great/2008/08/15/1218307227410.html
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