The 55-year-old explained that the news that her sisters Linda and Anne are both fighting cancer together, receiving their diagnoses just days after one another, is seeing the star consider a mastectomy in the future.
Speaking on the ITV magazine show, Coleen said things had been difficult for the family.
“It’s hard, it’s really hard,” she said.
“As usual with my sisters, they’re obviously devastated but they just went for it and now they’re battling it. They’re nearly at the end of their chemo.
“So It’s very difficult for me to sit at home and cry or feel sorry for myself when I see them being so stoic and still laughing. Obviously they have terrible days where they are incredibly ill.”
Coleen added that the coronavirus lockdown has made things even harder as she cannot have any physical contact with Linda, 61, and Anne, 69, as they are both marked as high risk.
“It’s really hard because I can’t go and see them as they’re very high risk now,” she continued.
“Your initial thing is you just want to jump in the car, go to Blackpool and put your arms around them and you can’t, and it’s heart-breaking.
“I’m very lucky because I’m here with my children and they get me through everything, and my family – we’ve got the WhatsApp group going. We try and speak every day on that, even if it is just texting.
“You get to a place where you feel, you’ve just got to get through this. We’ve got each other and we’ll fight it.”
Anne has been diagnosed with breast cancer, while Linda’s incurable cancer is in her liver, following breast cancer in 2006, cellulitis and lymphoedema in her arm in 2007 and secondary cancer on her pelvis in 2017.
Cancer has deeply affected the Nolans, with the family losing sister Bernie from breast cancer in 2013.
“It makes you question your own mortality – cancer has devastated my family and has for lots of family,” an emotional Coleen continued. “I’ve had some lovely messages from the general public who are going through it or been through it. But obviously for me, my knee jerk reaction was I need to get [my breasts] off me. They’re like timebombs. It’s something I’m seriously considering and going down the route of to get all the professional advice I can get.
“My sisters are unbelievably great, but they’re both scared. I cant believe I’m crying.”
The emotional interview saw Andrea McLean call for a commercial break so her co-star could have a few minutes to herself before carrying on with the show.
Anne and Linda announced their diagnoses in The Sun, where they both spoke emotionally about what they were going through.
“I love my daughters, my grandchildren, my friends, all my family,” Anne said. “I want to live for as long as I possibly can.
“I am scared of dying as well. Even though I believe in God, I’m still scared.”