Transcript for Joan Lunden Shares Breast Cancer Diagnosis
friend, Lara. The people who stand by you are your family. And you know and love Joan Lunden. Long-time co-host of "Good morning America," with Charlie and Spencer. He's been part of our extended family and always will be. She's chosen to come here this morning, to share something personal with all of us. It's good to see you. Great to see you. What is it you want to share with people? I heard those words that every woman fears and never wants to hear. You have breast cancer. And in the beginning, it's such a shock, it's a stunner. And you think, I do everything right. I get checked. And I'm healthy. And for me, I'm a health advocate. I'm all over America talking to women saying, make sure you get all of your checkups all of the time. And in the beginning, you almost feel like, what did I do wrong? And then, I just turned a corner and said, wait a second. I'm a health advocate. Not this off. Learn everything you can about this. And go into warrior mode. That's where you are. You're in warrior mode right now. Many people have been touched by cancer. Until it is you, and until those words are said to you. You were having your yearly -- Religiously. I have my mammogram every year. And I have dense fibrous tissue. I come out of there. And you come out of there, one more year, I'm okay. And you go happy-go-lucky into the ultrasound. And she kept going back to one spot. And I said, they found something. And then, they do a core biopsy. And you have to wait. And my husband went in there with me. And I could just tell by her demeanor. The words are almost surreal when you hear you have interest cancer. And you talk about your husband. You have an incredible team Joan. They're by your side. Your children. How important is that to have that support system? When something like this happens, you learn just how important it is. And he's a rock. I have one of the best husbands anyone could ever ask for. He's there every step of the way. And he gives you so much strength. And my three older girls, as people watch over the years. You saw Jamie, Lindsay and Sara grow up. And the little twins. I have twins who are 11 and twins who are 9. And we sat them down and told them. Because we found it early, I was able to tell them that mommy's going to be okay. And that's really the bottom line. You know, you can't be afraid of what you might hear because that's what can really cause you real problems. As I said, focus on the fear and not the fright. That's what you've been doing. You've already begun treatment. What can you share with us? I have the more aggressive kind. It's going to be the chemotherapy and the surgery and the radiation. And so, I've got that journey ahead. I've already started. I'm doing my chemo. And I wondered how I should go about coming back and contacting. I've shared my entire life journey with the people on the other side of that camera. It only stood to reason I would share this. That's when I called you. I know when you called me, Joan. And we had that discussion. And you didn't know how or why or should you go public. And then, you realized, that is your life's work. And you also talked about your father. My dad was a cancer surgeon. When I was about 14, he was returning home from speaking at a cancer conference. And he was killed in our private plane flying home. And I always wanted to grow up and be a doctor just like him because I so admired him. But I couldn't hack the scalpels and stitches and things. I learned that quick. And I said going to bed, if he was looking down, he would say, all right. You've got this. And you lived your life in front of an audience, use it. Go out, try to inspire and maybe save lives. You don't have to be a doctor with a scalpel to accomplish that. And it changed how I was looking at it. I went from being a victim to being empowered. And having a purpose. It's an odd way to allow me to fulfill his legacy. But so be it. This is how it landed in my lap. It is. You are a messenger. That's so important. I say make your mess your message. In her book, your mom always said that. Make your mess your message. And Amy and I are right here with you. I know. And so is all of your extended family. Just what a privilege to always be in your presence. We are here for you. We wish you all the very best. I feel it when I walk into the studio. So many familiar faces. We love you, Joanie. Please keep in touch. Thanks so much.
This transcript has been automatically generated and may not be 100% accurate.