Its chief medical officer says the Oura Ring helps detect “multiple cases of lymphoma.”

The Oura Ring has become as synonymous with smart rings as Kleenex is with tissues. With a 74% share of the category, according to Omdia November 2025 ReportIt helped define an entire category of health wearables.

As someone who spent months mining data for my Oura Ring, I thought I had a good handle on what it could do. But after sitting down with ORA’s first-ever chief medical officer, Dr. Ricky Bloomfield, it became clear that I was leaving a lot on the table.

Bloomfield, a former physician and Apple Health executive, joined Oura in 2025 to help shape how the company’s data is translated into real-world health insights. And the fact that he came to our interview wearing several Oura Rings proves that he literally has his finger on the pulse of how technology enables health.

Our conversation led me to uncover tools I’d overlooked, learn the real story behind my favorite feature and rethink what’s possible when it comes to tracking your health from your finger. Spoiler: It’s more than just catching a cold early.

Symptom Radar: The best pivot to emerge from the COVID-19 pandemic

One of my favorite features of the Oura Ring is the Symptom Radar. At its core, it’s a dashboard of vitals that gives you an alert when one deviates from your personal baseline, meaning it can give you an actual indication that your body might be under stress before you even register it completely yourself.

“For a lot of people, it’s like the check engine light on a car,” Bloomfield says. “Most of us are not experts on our cars — we may hear a funny sound, but seeing that light appear on the dashboard is confirmation that we need to do something about it.”

My toxic trait is the belief that I can remove illness from existence by ignoring it, and I often continue to do so to the point of collapse. Symptom Radar gave me the objective confirmation I needed to allow myself that rest day and I would likely recover faster than if I had just crashed myself into the wall.

However, Symptom Radar’s beginning was anything but linear. In 2020, at the height of the COVID-19 pandemic, Oura collaborated with the University of California, San Francisco, on A study called TempPredictwhich tested whether loop data and daily symptom surveys could predict COVID-19 before symptoms appear, and capture its onset, progression, and recovery.

You succeeded.

“What we found is that we can actually detect signs of Covid-19 2.75 days earlier than someone would detect with a Covid test,” Bloomfield said.

This is the kind of time limit that could change behavior, perhaps preventing people from spreading the disease and encouraging them to seek treatment early.

But turning that into a consumer advantage was complicated. Launching our COVID-19 detection tool has been a long time coming New FDA approval process (Probably spanning years) because there was nothing like it on the market at the time.

So they flipped. Instead of the coronavirus detection feature, Oura has released Symptom Radar as a health tool to report deviations from your essential vitals without indicating a specific diagnosis. It was broad enough to avoid a regulatory hurdle, but useful enough to prompt action and a conversation with your doctor.

When the check engine light leads to a dangerous place

What neither Oura nor its customers expected was how far the simple anomaly alert would reach beyond cold and flu season.

“We have now seen multiple cases of lymphoma that have been detected with this,” Bloomfield said. “All four cases of lymphoma were young women with vague symptoms.”

The episode did not detect lymphoma. But frequent symptom radar notifications were the push women needed to have a conversation with their doctor and seek out a diagnosis for whatever ails them.

“In all of these cases, they may have reached that diagnosis eventually. But the important thing here is that time is of the essence for something like lymphoma, which is a form of cancer, and the sooner you can see and evaluate something like this, the better your chances of having a positive outcome,” Bloomfield said.

This is not limited to lymphoma only. Similar patterns have emerged with appendicitis, where frequent symptom radar alerts have prompted Oura Ring owners to seek care before their appendix ruptures (a serious complication if detected too late).

In other cases, the signals are less urgent but just as revealing. Some people even notice patterns in their data that indicate pregnancy before taking the test.

“Of course, we don’t have a feature that detects pregnancy, but they monitor the data themselves, and they are able to draw those conclusions,” Bloomfield said.

Symptom Radar 2.0

Condition-specific alerts could be the next frontier for Oura, and the company is already laying the groundwork. Through Oura Labs (in the Oura app), ring owners can sign up for a clinical study focused on detecting high blood pressure. This shift from general signals to more specific, clinically validated insights could be a preview of what a more targeted version of Symptom Radar could become.

Unlike the current feature, this type of detection crosses into a regulated area. “We have publicly indicated that our plan is to take this feature to the FDA once enough data is collected,” Bloomfield said.

This is the same path that companies like Apple have taken with features like Electrocardiogram and Notifications related to high blood pressure. Oura is also studying women’s health through Oura Labs, expanding its focus into areas such as cycle tracking and reproductive health.

Why might the finger know more than the wrist?

After years of testing wrist-based wearables, the idea of ​​a ring tracking similar metrics from a smaller surface always gave me pause. In my opinion: larger sensor plus larger surface area equals more information. Turns out, bigger isn’t necessarily better, and placement may be more important than size. According to Bloomfield, the finger is actually the ideal place for this type of biometric data.

“You have two arteries running along the bottom of your finger, actually called digital arteries, which makes them a better place to measure physiological signals,” Bloomfield said.

The signal quality advantage is especially evident at night, which is exactly when the ring gains its status. Wrist-based wearables can be too bulky to be worn comfortably while sleeping, and many still need to be charged at night. The ring is precise enough for sleep, and with up to seven days of battery life, it doesn’t need to be charged before bedtime.

“Because you’re not moving during sleep, you get a more accurate signal,” Bloomfield said. “You also get a more accurate temperature, which is important for a number of features, including women’s health features, cycle tracking, and fertile window prediction.”

The temperature of the skin fluctuates throughout the day as you move in and out and add and remove layers, like a glove. But at night, in a more controlled environment, that data becomes reliable enough to act on.

Bloomfield also confirmed that using the ring only when sleeping is a legitimate strategy. You’ll miss things like daytime stress tracking, automatic activity detection, and results that require constant wear and tear, but you’ll still be able to capture the richest window of data.

The feature you actually sleep on

Not one to leave potential health gains on the table, I asked Bloomfield which underutilized advantage could have the biggest impact. His answer: cardiovascular age.

“We had employees at Oura who saw that their cardiovascular age was plus 5, plus 8. That was the motivation they needed to start exercising,” he said. “Once you change your behavior, and start exercising consistently, you will see the value start to improve over time.”

According to Bloomfield, the feature measures pulse wave velocity: the speed at which your pulse travels through the large arteries, including the aorta, carotid arteries, and femoral arteries. This speed is an indicator of arterial stiffness, which is linked to overall cardiovascular health. Stiffer arteries generally indicate older cardiovascular age. More elastic arteries mean the opposite.

I knew I’d seen him before but couldn’t locate him during our interview, which probably explains why people miss him. It’s located under the “My Health” tab at the bottom of the app and requires data from at least 14 days (within the past 30 days) to open.

I turned out to be 8.5-10 years younger than my actual age, which was a pleasant surprise. But bragging rights aside, it’s a surprisingly accurate reflection of how active I am in a given week and a useful reference point for tracking positive changes.

The long game

The broader vision described by Bloomfield is a shift from reactive healthcare to proactive healthcare: a system in which your ring helps you ward off illness and can flag something worth investigating before you have any reason to call your doctor.

“We’re moving from a health care system where we’re seeing primarily reactive, divide/repair type care, to a world where we want to focus more on prevention and proactive care,” he said.

Making this vision accessible to people who can afford a $300 ring is something Oura is actively working on. The company has partnered with Essence Healthcare, a Medicare Advantage plan serving members in the Midwest, to provide the ring as a covered benefit at no cost to plan members.

“Insurers want their members to be healthier, and it’s a win-win situation. If members are healthier, health care costs are lower, and the member enjoys the benefits of being healthier.”

The partnership expands in 2026 after its first year, a sign that insurance-backed wearables may not be far away.