ABC

Deion Sanders says a routine activity like going to the bathroom was "the most excruciating pain I've ever felt in my life" after undergoing surgery ... detailing the hardest part of his bladder cancer battle.

The Hall of Famer and Colorado Buffaloes football coach sat down with Michael Strahan on "Good Morning America" to discuss his recent medical issues ... revealing doctors gave him two options after spotting the tumor during a scan.

Sanders said he had to either have his bladder removed or do 36 weeks of chemotherapy. The 58-year-old chose the procedure ... and admitted the recovery was agonizing.

"It was tough," he said. "So, I remember laying there, and they said, 'Well, you need to go try to pee.' That was the most excruciating pain I've ever felt in my life."

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