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She went on to write, "Many people have asked why I never took on addiction as a cause as first lady. I couldn’t. I really don’t have any answers, even though I deeply empathize with those who love people struggling with addiction."

7 years sober today. Thank you to everyone who has walked this road with me. pic.twitter.com/aA7AKmzLjB

She revealed that after he came off-stage at the debate, he whispered to her, "I really f**ked up, didn't I?" 

"'Yes, you did,' I whispered back," Jill confessed. 

She went on to say that she still doesn't know why he performed so poorly, insisting that he was not his usual self on that fateful night.

According to Jill: "'I want it sooner,' she said.

'I'll call you back when I figure this out,' Joe said.

'Could you do it soon?' she replied. 'Say, in twenty minutes?'"

Jill writes that she then left the room. Joe ultimately ended up endorsing Harris to take his place on the Democratic ticket shortly after announcing his withdrawal from the race. 

She continued, "Knowing that Joe would prefer to speak about any urological issues with his male doctors rather than his wife, I alerted one of them to make sure they knew. Now that the doctors had been made aware of the issue, I trusted that Joe would be examined and treated. But as far as I could tell, the issue persisted. Even knowing this, I never imagined that the cause of this very common symptom of age would turn out to be cancer."

His symptoms worsened after leaving office, which ultimately led to his diagnosis. Prostate cancer screening guidelines recommend that men over 70 "should not be screened for prostate cancer routinely," which likely also contributed to Joe Biden's delayed diagnosis.