Gibb, whose twin brother Maurice died at 53 of twisted intestine caused by a congenital defect shared by Robin, set the record straight after recently battling a condition widely reported to be cancer.
"It's all simple," he told BBC Radio 2's Steve Wright on Friday (via the Daily Mail). "I was diagnosed with a growth in my colon. It was removed. And I've been treated for that by a brilliant doctor, and in their own words 'the results have been spectacular.' "
After Gibb was rushed to the hospital suffering from abdominal pain in November, the Ministry of Gossip passed along a Sunday Mirror account alleging Gibb had liver cancer. According to the Sun, the singer later issued a statement saying he was being treated for inflammation of the colon.
Only last month, his spokesman told the BBC, "Robin is responding well to treatment and we are very upbeat about his recovery. As always chemotherapy has taken its toll, but Robin feels good."
About his shockingly thin appearance, Gibb said no worries -- his appetite is great again and he's looking forward to gaining some weight.
"I love food, I love eating," he told the BBC, adding, "I've always been thin. If you go back to when we first started I've always been skinny. It's hard for me to put on weight."
The singer and prolific songwriter, who enjoyed massive worldwide fame as part of the Bee Gees with Maurice and older brother Barry Gibb, will make his classical music concert debut in April. Robin Gibb will lead a performance of "The Titanic Requiem," a new work composed by him and his son, RJ, on the 100th anniversary of the ship's sinking.
Hear a bit of "The Titanic Requiem" as it was recorded, and see the two collaborators discussing the project, in the video below."Jive Talkin'," this ain't.
Photo: Robin Gibb on "American Idol" in May 2010. Credit: Vince Bucci / Fox