In the country superstar's Netflix documentary, "Shania Twain: Not Just a Girl," she revealed she suffered from "blackouts" and "dizzy.
The singer had been bit by a tick while horseback riding in 2003 and labeled her symptoms "quite scary."
"Before I was diagnosed, I was on stage very dizzy," she explained. "I was losing my balance, I was afraid I was gonna fall off the stage."
She added, "I was having these very, very, very millisecond blackouts, but regularly, every minute or every 30 seconds."
Her chronic illness impacted her ability to perform and Twain developed dysphonia, which resulted in the temporary loss of her voice.
"My voice was never the same again," she confessed. "I thought I'd lost my voice forever.
Shania went through several invasive surgeries to correct her dysphonia and told Extra in an interview in 2019,
"In that search to determine what was causing this lack of control with my voice and this change in my voice, I was facing a divorce.