The American, 50, once the fastest man in the world over 200m and 400m, tweeted that he had a "transient ischemic attack" last week.
He said: "Last week I rather surprisingly suffered what's known as a Transient Ischemic Attack or mini stroke.
"The good news is I'm back at home with my family, cleared of any heart issues and have already made great progress on my road to a full recovery.
"It seems these things can affect anyone, even the once fastest man in the world!
"I'm no stranger to a good exercise plan and have thrown myself into it with my usual focus and determination.
"In these situations being a former athlete has really helped with mindset but also a reminder that you need to take care of yourself.
"I will be posting updates on my recovery often. Thanks for all the words of encouragement!"
Johnson, famed for wearing those golden shoes at Atlanta 1996, is a four-time Olympic champion.
The regular face on BBC television during athletics coverage also won eight World Championship golds.
Johnson became the first man to win both the 200m and 400m at the same Olympics in Atlanta.
He retired in 2000 after defending his 400m crown in Sydney.
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