Addressing listeners on his program Monday, Limbaugh said will take some days off for further medical tests and to determine treatment.
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"First realized something was wrong on my birthday weekend January 12. And I wish I didn't have to tell you this and I thought about not telling anybody. I thought about trying to do this without anybody knowing because I don't like making things about me. But there are going to be days that I'm going to be able to be here because I'm undergoing treatment or I'm reacting to treatment," he said.
Limbaugh called himself the "mayor of Realville" in announcing his illness. He'd been experiencing shortness of breath that he initially thought might be heart-related but turned out to be a pulmonary malignancy.
"So this has happened and my intention is to come here every day I can and to do this program as normally and as competently and as expertly as I do each and every day because that is source of my greatest satisfaction professionally, personally," he said.
Limbaugh's announcement come at a tumultuous political time, as the conclusion of President Donald Trump's impeachment trial nears.
"It's shocking to the industry, and it should be shocking to the political establishment," Michael Harrison, publisher of Talkers magazine, the trade industry publication for talk radio, said of Limbaugh's disclosure.
He started his first national radio show in 1988 from New York, later relocating to Palm Beach, Florida.
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The hyper-partisan broadcaster has dominated talk radio with a raucous, liberal-bashing style that made him one of the most influential voices of American right-wing politics and inspired other conservative broadcasters including Sean Hannity, Glenn Beck and Bill O'Reilly.
"Rush you are in our prayers," Beck tweeted. "We live in a time of modern miracles. Millions are praying you find one."
Limbaugh said he intends to work as much as possible. He also said he had focused more "intensely" in the past two weeks on what he called his "deeply personal relationship" with God.
The media figure's endorsement and friendship is a conservative political treasure. His idol, Ronald Reagan, wrote a letter that Limbaugh read on the air in December 1992 and which sealed his reputation among conservatives: "You've become the number one voice for conservatism in our country," Reagan wrote.
Two years later, Limbaugh would be so widely credited as key to Republicans' takeover of Congress for the first time in 40 years, he was deemed an honorary member of the new class.
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Limbaugh has frequently been accused of hate-filled speech, including bigotry and blatant racism through his comments and sketches such as "Barack the Magic Negro," a song featured on his show that said Obama "makes guilty whites feel good" and that the politician is "black, but not authentically."
His popularity has survived brickbats and thrived despite personal woes.
In 2003, Limbaugh admitted an addiction to painkillers and entered rehabilitation. Authorities opened an investigation into alleged "doctor shopping," saying he received up to 2,000 pills from four doctors over a period of six months, but he ultimately reached a deal with prosecutors that dismissed the single charge.
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Some information from the Associated Press