Dai Henwood says he felt he needed to give back to Cancer Society after help with his diagnosis

Comedian Dai Henwood says he couldn't have turned down the chance to be a Daffodil Day ambassador as he felt it was "a great way to give back" after the support he and his whānau received during his ongoing cancer treatment.

He's currently on his 20th round of chemotherapy after he revealed he had stage 4 bowel cancer in January.

Henwood will be hosting The Comedy Treatment, a live show of support for the Cancer Society, at Auckland's Q Theatre on August 24. 

"I went public with such a heavy diagnosis," Henwood told AM hosts Laura Tupou and Ryan Bridge.

He said the outpouring of love prompted him to think about what else he could do and that he "felt like [it was] a great way to give back" given the support he'd received from the Cancer Society.

"I've got young kids, how do you talk to them about it?" he said. "I've learned so many tools from them."

He also said he'd chosen "not to suffer" with the diagnosis, even though chemo was "like having the worst hangover of your life for five days but you had none of the good times".

He told Bridge and Tupou he was looking forward to being part of the live show.

"I'm so stoked to do it, because I love comedy. Comedy is a zen place for me, when I'm on stage telling jokes, I don't think about cancer. I'm just in the moment."

Watch the AM video above.

ANZ presents The Comedy Treatment, a show of support for the Cancer Society, will be held at Q Theatre in Auckland on August 24 with all profits from ticket sales donated to the Cancer Society. Tickets are on sale here and the show will also be aired live on Three and ThreeNow at 8:30pm on August 24.