Chris Evans is having tests for prostate cancer after showing symptoms since Christmas.
The Radio 2 DJ told his listeners on his Friday morning programme that he Googled the symptoms then went to his doctor. He is currently being tested for the disease, but confessed being frightened of seeking help at first because "I'm a bloke".
Evans told listeners the news after prostate cancer survivor Kenney Jones, drummer for The Who, had appeared on the station.
"Prostate cancer, and colon cancer of course, are one of the most survivable forms of cancer there is, if caught early enough. It not, one of the least, it's said," Evans said
"It's a fine line between life and death, happiness and tragedy, and I've got to say I'm in the middle of a prostate issue right now."
"I couldn't stop. I have not been able to stop since Christmas, peeing or wanting to go. So I've gone to the doctor.
"I've done all the internet stuff that you shouldn't do, I've gone on the internet, scared myself half to death, then gone to see the doctor. And we really should do it the other way round," he added. "However, I'm in the middle of the tests."
Evans also had advice for his listeners, and urged them not to delay getting help. "If you are worried about anything just go and sort yourself out - if not for you, for your family," he said.
Evans, who has three children, added: "I was scared of them [the tests]. I'm a bloke, remember."
Kenney Jones, who is a spokesperson for Prostate Cancer UK, has endorsed the charity's Men United campaign to help men find the courage to get tested.
"I’ve had amazing support from Prostate Cancer UK and I’d tell everyone to sign up to Men United and help them get better tests and treatments for men," he said. "I was lucky that my disease was caught early – but with one man dying in the UK every hour from the disease, there’s a long way to go."