Katie Thurston talks about her cancer journey, says the worst feeling I've ever felt

Notably, earlier in March, Katie announced that spots had been detected on her liver, meaning that her cancer is now stage 4.

In an Instagram Video shared on March 28, she informed her fans, saying, "I know stage 4 can sound very scary, and it can be."

Katie celebrated her 34th birthday, but her world turned upside down when she was diagnosed with stage 3 breast cancer, according to E! News.

Less than six weeks after Katie celebrated her 34th birthday, she was diagnosed with stage 3 breast cancer.

It was "the worst feeling I've ever felt," she recalled on the show Good Morning America. "You're just devastated. You're so devastated. It's so shocking. As a 34-year-old woman, you're not prepared," according to E! News.

Katie recalled that she was initially tensed when she found a lump in her breast last summer. She thought it might be related to her period, soreness from working out, or from a benign cyst in her breast she had removed when she was 20.

But when the lump didn't go away months later, the reality star decided to get it checked out.

After the ultrasound, mammogram and biopsies taken for testing, Katie came to know about her illness.

"I think my appointment was February 5," she shared in a March 18 Instagram video. "And then by February 13th, I got the official call that it was indeed breast cancer," as per the outlet.

She announced the diagnosis on February 15. Katie kept sharing updates about her journey, treatment, experience with embryo freezing and search for answers in her ongoing health battle.

"You're on survival mode," she said, adding, "You don't have a choice. You show up or you die, and I hate to say it that way, but every day you have an appointment, every day you have to show up. You don't have a choice."

Katie later announced that spots had been detected on her liver, meaning that her cancer is now stage 4.

"I know stage 4 can sound very scary, and it can be," she said in a March 28 Instagram video. "But given that I am triple-positive and the spots on my liver are fairly small and detected early, I feel very optimistic on my outcome," according to E! News.