Shannen Doherty reveals stage 4 breast cancer diagnosis

After nearly five years since the famed "90210" and "Charmed" actress' initial breast cancer diagnosis, she told ABC News "I'm stage four – my cancer came back," and has kept it private for a year.
6:58 | 02/04/20

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Transcript for Shannen Doherty reveals stage 4 breast cancer diagnosis
Now to that exclusive interview with shannen Doherty sharing for the first time a new turn in her private health battle as she talked to Amy about it. Good morning. Good morning. Shannen Doherty has been hard at work filming the "90210" reboot why bearing this burden and only shared it with her immediate family and one cast member who says they've all helped her through this terrible time. Reporter: Three decades shannen Doherty has been a television fixture rocketing to fame as Brenda on "90210". I thought I felt something. Where? Here. Reporter: And on "Charmed." We're desperate and it's working. Reporter: Then 2015 a shocking breast cancer diagnosis. And years later remission. Now nearly five years after that initial diagnosis, Doherty is revealing a new struggle. Tell me why you're sitting here today. It's going to come out in a matter of days or a week that I have stage 4 so my cancer came back and that's why I'm here. You've been living with it privately for a year now, correct? Yes. You wanted to keep it private. I still do. I mean I don't think that I've processed it. It's a bitter pill to swallow in a lot of ways. It's not fair. Why me. There are days when I say why me then I go why not me? Who else? Who else besides me deserves this? None of us do. I would say my first reaction is always concern about how am I going to tell my mom, my husband? You're worried about everyone else around you. I think so. Reporter: Doherty went back to work on the set of the "90210" reboot which launched soon after Luke Perry's tragic passing. What was going through your mind at that moment because you didn't share this with anyone. Why wasn't it me? So weird. For me to be diagnosed and then somebody who was, you know, seemingly healthy to go first. It was really like shocking and the least I could do to honor him was do that show. To Luke. To Luke. I still haven't done enough in my opinion so it's a hard one because I thought, well, this will -- when I finally do come out I would have worked 16 hours a day and it will be a good -- people can look at that and say, oh, my god, she can work and other people with stage 4 can work. Our life doesn't end the minute we get the diagnosis. We still have living to do. How did you make it through shooting? Keeping that dark secret. Brian Austin green. Wherever you are in life is exactly where you're meant to I had moments of great anxiety where I thought I can't do this and Brian was the one person who of that group of people that knew that I told like pretty quickly and said, here, this is what I'm dealing with so prior to shooting he would always call me and say, listen, whatever happens, like I have your back and we were able to talk about Luke in a way that was very positive and uplifting and sort of remember a lot of great moments. Reporter: Amid her battle with cancer Doherty is in the middle of a fight with her insurance company state farm. After her California home was damaged in the woolsey fire in My house was severely damaged. You walk into the house and it just wreaked of smoke. And, you know, I tried. I communicated with my insurance company. I called. I got passed around from claims adjuster to claims adjuster so I ended up suing state farm and the result has been one of the most horrific processes I have ever been through. Doherty claims she has been forced to pay out of pocket for losses she believed should be covered by her insurance policy and that some of her claims have been unjustly denied. State farm telling ABC news, we empathize with Ms. Doherty's health issues and wish her a full recovery adding we strongly believe we've upheld our commitment to our customer and paid what we owed on this claim. State farm says they have paid nearly $1.1 million to clean and repair plaintiff's home and personal property and for temporarily housing and furniture rental adding that the plaintiff nevertheless alleges she is entitled to additional benefits under her homeowner's policy. Doherty says she's only speaking out about her cancer diagnosis because court documents detailing her health conditions will be made public ahead of the trial. You want to own your cancer story. Yeah, I mean I'd rather people hear it from me. I don't want it to be twisted. I don't want it to be a court document. I want it to be real and authentic and I want to control the narrative. I want people to know from me. How do you handle the fear? I don't know. I mean I'm petrified. I'm pretty scared. My mom is, you know, a ridiculously strong, courageous human being. So is my husband but I worry about him. Lawsuit aside, have you decided how you want to live? Are you going to change how you live? I think the thing I want to do the most right now is I want to make an impact and I can make that impact through the lawsuit and by saying enough is enough with big business and corporations running the little person over. It's not fair. And I'm taking a stand for all of us but it's more about how I want to be remembered for something bigger than just me. State farm says they are prepared to defend their position in court while Doherty's attorney tells us the situation has cost their client dearly in time, energy and emotional well-being, all while suffering a terminal illness but I wanted to share something shannen said is helping her get through a quote she loves. We have heard yolo. She says you only die once. You live every day. And that's how she's living her life right now. That's what Stuart Scott said. You beat cancer in the manner in which you live and she is showing how to live with cancer and it is very difficult. We know this to go public with something because people treat you differently. She had a fear that she would not get work because of that, because people look at you differently so for her to come forward now. So brave, so courageous. A lot of fight in her. She made that very clear. She is going to go down fighting is what she said in every way. She is. Much more of the interview tonight on "Nightline" with shannen Doherty. Thank you. George, you have to head out

This transcript has been automatically generated and may not be 100% accurate.

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