Her smart ring knew she had cancer 8 months before docs finally listened
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The Oura Ring, for example, measures about 20 different parameters, things like body temperature, respiratory rate, heart rate, heart rate variability, and you can imagine how, if something is off, it could be a clue to something else going on.
—Tara Narula, MD, via ABC News
Last August, Casey Cattie found herself grappling with nagging symptoms, like waking up with night sweats, that she could neither pinpoint nor ignore. []
But what truly jolted her was the persistent warnings from her Oura Ring app that she was showing signs of major illness.
Cattie saw more than one doctor, but none could figure out the cause of her symptoms.
Then, in the spring of 2025, Cattie experienced a medical emergency in which doctors told her they suspected she had cancer. She was diagnosed with stage 4 Hodgkin lymphoma in April, 8 months after her wearable first detected a problem.
How technology can clue you in on health conditions
Although the Oura Ring—a sleek, unobtrusive wearable resembling a ring—is primarily marketed for monitoring sleep, physical activity, heart rate, and basal body temperature, Cattie's story demonstrates its potential to function as an early-warning system of sorts.
However, the device is not a medical diagnostic tool and is not intended to monitor, treat, or prevent illness. Its strength lies in offering biometric trends that may support proactive health awareness, often prompting users to seek care when something feels off.
Other Oura Ring users have reported similar experiences. For instance, one Paralympian credited the ring with helping detect appendicitis in time, and a nurse from Virginia also found out she had cancer. []
Board‑certified cardiologist Tara Narula, MD, praised the potential of wearable health trackers like the Oura Ring to encourage earlier care‑seeking behaviors. Yet she cautioned patients to remember: These devices are not substitutes for clinical evaluation or diagnostics. []
"The Oura Ring, for example, measures about 20 different parameters, things like body temperature, respiratory rate, heart rate, heart rate variability, and you can imagine how, if something is off, it could be a clue to something else going on," Dr. Narula said. "But it's important to say, as it does on the device—here's a disclaimer—that this is not a medical device. It cannot diagnose, cure, treat, prevent, or manage medical conditions." []
Related: Smart devices designed with health in mindWhat this means for physicians
Encourage patients who use biometric wearables (like Oura Ring, smartwatches, etc.) to share concerning or persistent deviations from their health baselines.
If a patient reports sustained abnormalities—such as temperature spikes or abnormal heart‑rate variability—even in the absence of clear symptoms, consider further evaluation or closer follow‑up rather than dismissing them outright.
In other words: These devices aren’t diagnostic, but they can inform clinical insight. Anomalies outside an individual’s typical baseline—especially when paired with vague symptoms—merit attention.
As wearables become more widely adopted, empathetic clinicians who leverage these patient-generated data streams can empower earlier intervention, potentially improving outcomes.
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