Wearables Look to AI to Predict and Prevent Health Problems

Haley Billey bought an Oura Ring to track her fertility. It arrived the day after she learned she was pregnant. She slipped the $450 titanium band on anyway.

Months of worrisome readings on measures of energy and stress, levels she initially attributed to pregnancy, persuaded her to seek a professional opinion. The ultimate cause: Hashimoto’s disease, an autoimmune disorder.

“The ring can’t diagnose you,” said Billey, 31, a manager at National Park Friends Alliance in Ann Arbor, Michigan. At least “I can look at the data and take it to my doctor.” But she’d like the ring to do more.

So she’s now handing over personal ...