Amy Robach Cancer Battle: 'GMA' Host Thanks God for Robin Roberts' Support (VIDEO)

"Good Morning America" host Amy Robach revealed that she has breast cancer and will undergo a double mastectomy this week. In her revelation, Robach gave thanks to God for co-star Robin Roberts' encouragement and support.

Robach underwent the mammogram on a live episode of "Good Morning America"; Roberts was the one who encouraged her to do so after learning that she had never had a mammogram and was 40 years old.

"Amy, next week we'd like you to do the first ever live television mammogram for 'GMA' Goes Pink day. You're 40, the age women should start getting mammograms. Would you even consider it?" Roberts wrote in a post for ABC.

Robach revealed that she did not want to go through with the experience but looked to Roberts' example for guidance. Roberts was diagnosed with breast cancer and beat the odds; she is currently in remission and urged Robach to have the procedure.

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

"You saved your life, Amy," Roberts replied.

While Robach did not reveal much about her diagnosis, such as what stage of cancer she has, it is serious enough that she is having a double mastectomy on Thursday. She will leave ABC for a while to recover and will hopefully make a triumphant return, much as Roberts did earlier this year.

She is the mother of two daughters and three stepsons and has been married to actor Andrew Shue since 2010. Robach initially started off as an anchor on NBC but transitioned to ABC family and frequently appears on "Good Morning America."

"I can only hope my story … will inspire every woman who hears it to get a mammogram, to take a self- exam. No excuses. It is the difference between life and death," Robach wrote in her post.

Watch Robach's emotional revelation here: