Survivor star Ken McNickle has been diagnosed with cancer.

On Monday, June 1, the 43-year-old — who was the season 33 runner-up of the reality competition series — posted a photo on Instagram of him sitting in the hospital, and shared his health news .

“That moment when you hear the words ‘it’s cancer’ and everything becomes muted,” he wrote. “The doctor sounding like the teacher from Charlie Brown. You realize nothing is registering other than that one word.”

“And then the flood of questions. Why now? What did I do to deserve this? Why didn’t I come in sooner? After everything else, now this? And then the feeling of defeat and you hear the words ‘f— it’ start to creep in. The beginning of the process of giving up,” he continued. “And then I think about my daughter, my lady and the life we want and how there’s another option… to fight. Because there’s always a choice. And I’m choosing optimism, health, happiness and knowing that the spirit has me. And most importantly, I’m choosing love.”

In the caption, McNickle said that he contemplated not sharing his diagnosis publicly, but ultimately decided that it could help others. He also vowed to share more moving forward.

“If you have a health concern, don’t sit on it,” he added. “Get yourself checked. There’s no valid reason not to. Not one.”

Although McNickle didn’t provide any specifics about what type of cancer he has, he posted a follow-up video detailing some of the symptoms he experienced and the warning signs he ignored.

“I waited almost a year until my skin was tearing open to get this checked. And had I gone in sooner it would have been a simple procedure, not a 3-inch hole in my chest,” he said. “I waited for almost three months seeing blood fill the stool every morning before getting it checked out and confirmed that my insides were tearing open. And I waited until that lump on my testes had grown to the size of the other two before getting it checked.”

“I was wondering why so many times I had been so f—ing stupid,” he continued. “And then it hit me this morning. Flashes from my childhood and adolescence, hearing the words, ‘Stop crying. Don’t be a baby. Don’t be a bitch. Stop being a p—-. Just be a man.’ And yeah, I’m thinking that had something to do with it.”

McNickle then called for men to be more proactive when it comes to their health.

“There’s an epidemic in regards to men’s health and we’re not giving it enough attention,” he wrote in the caption. “We need to be talking more about why men are 50% less likely to go to a doctor for physical ailments and 60% less likely to get help with mental and emotional issues. Why do you think it is? What needs to change?”

For more SURIVIVOR updates, follow Daily News. Come back here often for Survivor spoilers, news and updates.