Originally published on ProWrestlingSheet.

Nikki Bella has divulged additional details on the reason for her retirement, saying she was forced to call it quits due to a herniated disc and cyst on her brain.

The Bella Twins were guests on last night's episode of The Tonight Show when the topic of their retirements was brought up. 

Nikki explained that she wanted to go back to WWE to wrestle for the Women's Tag Team titles, but test results from her doctor revealed that wouldn't be possible.

"And then it came back ... I herniated the disc above where I had (neck) surgery, I have all this inflammation around the metal and then, I have a cyst on my brain," she told Jimmy Fallon. "So, they were like, you're done, no more, you're out. So, I didn't get a choice."

According to Nikki (via Twitter), it sounds like this will be documented on Total Bellas next season.

Watch this portion of the interview below.