ABC reporter Amy Robach announced Monday on "Good Morning America' that she has breast cancer and will undergo a double mastectomy later this week.

"I've decided to be very aggressive," Robach told Robin Roberts on the show, according to the New York Daily News.

As part of Breast Cancer Awareness Month, The 40-year-old reporter underwent a mammogram on live television last month.

"Between flying all over the world for work, and running around with my kids to school and ballet and gymnastics like so many women, I just kept putting it off," she said of the test.

It was Roberts -- a breast cancer survivor -- who convinced Robach to take the assignment.

This Sept. 13, 2013 photo released by ABC shows co-host Amy Robach during a broadcast of "Good Morning America, " in New York.
This Sept. 13, 2013 photo released by ABC shows co-host Amy Robach during a broadcast of "Good Morning America, " in New York. (AP Photo/ABC, Heidi Gutman)

"Thank God you did," she told Roberts on Monday. "I had cancer the whole time we were sitting in that office, and I said, 'I don't have any connection to that disease.'"

A routine post-show checkup weeks later quickly led to more tests.

"I was asked to do something I really didn't want to do, something I had put off for more than a year, I had no way of knowing that I was in a life-or-death situation," Robach wrote on her ABC News health blog. "I would have considered it virtually impossible that I would have cancer. I work out, I eat right, I take care of myself and I have very little family history; in fact, all of my grandparents are still alive."


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Robach said when she was diagnosed, her family -- including her husband, "Melrose Place" actor Andrew Shue -- flew to be by her side and they began "gearing up for a fight."

"On Thursday, Nov. 14, I will go into surgery where my doctors will perform a bilateral mastectomy followed by reconstructive surgery," Robach wrote. "Only then will I know more about what that fight will fully entail, but I am mentally and physically as prepared as anyone can be in this situation."

Robach has two daughters from a previous marriage, while Shue, 46, has three sons.

"There's a lot you don't know until you have the surgery," she said on air Monday. "I don't know about chemo. I don't know what stage I am. I don't know if it has spread. So we'll find out those things in the weeks to come."

Contact Tony Hicks at Facebook.com/BayAreaNewsGroup.TonyHicks or Twitter.com/insertfoot.