UFC women's flyweight contender Maycee Barber has revealed the battle she's been enduring away from the Octagon.

When it comes to activity inside the cage, Barber has endured nothing but triumphs for the past three years. Since defeats to Roxanne Modafferi and Alexa Grasso stalled her rise, "The Future" has won six straight fights.

Most recently, Barber followed a a memorable, Performance of the Night-winning display opposite Amanda Ribas last year by getting the better of former title challenger Katlyn Cerminara at UFC 299 in Miami this past March.

But while that result thrust the 26-year-old into the top five at 125 pounds and left her calling for a title shot, she's since been struck down by factors away from the fight game.

Barber first experienced a mystery infection days on from her UFC 299 victory. After being hospitalized, the illness resulted in a bout of pneumonia. Having overcome that scare, she was booked to headline the UFC Fight Night in Denver against Rose Namajunas in July.

Ongoing health issues saw the Colorado native withdraw, however, and she's now lifted the lid on her continuing struggle to return to fitness and get past the issue, which Barber says 15 doctors have been unable to diagnose.