Last August, Casey Cattie began waking up in the morning soaked in sweat.

“I wasn’t hot. I was actually cold because I was under a fan,” Cattie, 30, of Philadelphia, tells TODAY.com. “It was completely drenching night sweats.”

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She had been wearing an Oura Ring a friend gave her, and since the nightsweats started, it often informed her that she was “ showing sings of major illness .” Cattie saw multiple doctors to get to the bottom of the changes in her body, but none could find the cause.

Then, this past spring, Cattie experienced a medical emergency while traveling in Iceland, where doctors told her they suspected she had cancer.

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