I reckon there are a few things missing in that translation, considering how long he was talking at times, compared to the amount of subtitles provided.
The whole story is weird.I will post two quotes from different outlets. ESPN and yahoo. There was no mention of cancer diagnosis. I was under the impression that he thought he had cancer and just freaked out?
"When I go to sparring, I told [manager Ali Abdelaziz], 'I'm only going to do pads,' but this was lying," Chimaev said. "I jumped in grappling sparring, did three rounds. Feel bad in my chest, I said, 'Coach, I go out.' I go home and start to [cough] blood. I was never scared about my life. I'm scared about what my mom is going to do after I die. My mom, my brothers -- I was thinking, 'What are they gonna do after I die?' I start with this MMA s--- because of my family. I want to make some good life with them."
Second one
“Yes, (the medical care in Las Vegas) was good but they made me train,” Chimaev told
RT Sport. “I was doing good at first, then they told me that I could start cardio training, and I felt sick again. I went to the bathroom and started coughing up blood. That just messed up my mind a bit. Honestly, it scared me. Cancer? Like, ‘I have been sick so long, why doesn’t it go away?’ Different thoughts were going through my mind. Plus, I was alone there in Las Vegas, struggling to overcome it all.”