The slapstick comedian was rushed to hospital in Sydney on Friday in what was described as a bout of poor health, but is said to have recovered sufficiently and will continue his two-week charity tour of Australia in aid of the Muscular Dystrophy Foundation.
"He went to hospital but was released shortly thereafter," Lewis's publicist Candi Cazau told MSN News. "[He was] just feeling a little under the weather."
"He's back at his hotel and back to his normal routine," she added, remarking that it was "nothing serious... I don't know where he gets his energy. He's non-stop".
The 85-year-old has suffered from ill health for much of his life, having survived two heart attacks, a severe back injury and prostate cancer.
Earlier this year, Lewis announced that he had decided to step down from hosting the annual Muscular Dystrophy Association Labour Day Telethon after 45 years.
Lewis will now continue his charity tour with appearances in Melbourne and Brisbane before returning to the US on July 4.