"Well that wasn't quite the finish to my year I had in mind!!" he wrote.
"Had some chest pain last night and into this morning & it kept getting worse. After some medical advice, I had to withdraw & was shipped off to the hospital to get my heart looked at. After 7 hours of tests all looks good with my heart thankfully."
Donald, 39, a four-times European Ryder Cup member, has won 13 times globally. He topped the world rankings for a total of 56 weeks between 2011 and 2012.
(Reporting by Andrew Both in Tokyo; Editing by John O'Brien)
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