FEARS SICKLY TWAIN IS TICKING TIME BOMB!

SUPERSTAR Shania Twain recently took a nasty onstage spill in Chicago during her 76-date concert tour, sparking fears the songbird is still suffering from the crippling effects of Lyme disease!

The Man! I Feel Like a Woman! singer, 57, bounced back to finish the show — but sources snitch the fall was a painful reminder her two-decade battle with the tickborne illness may never be over!

A friend tells The National ENQUIRER, “Shania has been on a long-term antibiotics treatment that’s helped her, but it’s a persistent disease.”