'Full House' star Dave Coulier reveals 45-pound weight loss, grueling side effects from cancer fights

"I haven't been able to eat solid food in months, and so I've lost 45 pounds. That's what you're seeing, and it's affected my ability to speak," he continued. "Some of you said that I sound differently. So yeah, you're right on with what you are seeing and what you hearing."

During Coulier's six-month checkup and PET scans after his first diagnosis, doctors discovered a flare-up had returned as an enlarged tumor. The actor believed the tumor was caused by his lymphoma, but later found out the two cancers were unrelated.

"I wanted to know, 'Why did my lymphatic system crash?' And I realized as I went down the rabbit hole, everything in my life was toxic," Coulier admitted. "My toothpaste, my shampoo, the garbage bags, the toilet paper, everything, skin cream, everything."

During an interview with Fox News Digital that same month, Coulier said paying attention to subtle changes in his body made all the difference in his cancer battle while talking about his new business venture - AWEAR Market.

"Listen to your body. Your body will tell you things," Coulier said. "And my body was telling me something's going on. I wasn't feeling right, and I didn't have a lot of energy. And then I was taking a shower one morning and felt a lump in my groin area. And had I just thought, 'Ah, I haven't been feeling very well. It's maybe a cold or something. My body is just naturally fighting this off.' Had I not taken the step to call my doctor, at the urging of my wife, Melissa - she said, 'We're calling now, and making that appointment' - things would have been much different. We caught it early."

"Your body will really send you some signals," he added. "And I think for a lot of us, we procrastinate, and we say, 'Oh, no, let this go and we'll see how it goes.' And when you get to that point with cancer - cancer is working out in the background every day. It's getting stronger and stronger, and it's a fight. So you have to be willing to put your pride aside and be a little vulnerable and go in and talk to someone who is an expert and those are your doctors. So I encourage everybody, talk to your doctors."

Fox News Digital's Lauryn Overhultz contributed to this post.