As he revealed in this interview with Stephen A. Smith - https://www.youtube.com/watch?v=LqY1okwgPk0

Triple H is one of the all time greats and one of my personal favorite wrestlers. He's one of the biggest reasons I fell in love with pro wrestling and still love it 16 years later. I'd love to see Triple H wrestle again, but his health comes first. Sincerely, thank you.