The calm dissolves. Panic floods in.
In an age when the body has become a dataset, millions carry on their wrists a device that promises clarity but sometimes delivers dread. For those whose minds already scan the horizon for danger, a number on a screen can unravel what the flesh itself had declared safe. Neuroscientists call it a prediction error — the gap between what the brain expects and what the watch reports — and for vulnerable individuals, that gap can open into a cycle of hypervigilance that the technology was never designed to create. The question these devices quietly pose is an ancient one: do we trust the wisdom of the body, or the authority of the number?
- A man finishes a walk feeling well, glances at his wrist, and within seconds his sense of safety collapses — the watch had become more real to him than his own body.
- The brain, wired to treat objective data as more credible than internal sensation, can spiral into alarm even when nothing is physically wrong, turning a health tool into a source of genuine crisis.
- For people with anxiety disorders, the device amplifies an already hyperactive threat-detection system — more checking breeds more worry, and more worry demands more checking, with no natural exit.
- Those with eating disorders face a sharper edge still, as calorie and activity tracking can quietly reinforce compulsive behaviors under the guise of wellness.
- Experts are now recommending deliberate device-free periods as a diagnostic act — not to reject technology, but to rediscover where useful information ends and compulsive dependence begins.
A man finishes a long walk feeling perfectly well — steady breath, calm body — until his smartwatch shows a heart rate of 130 bpm. Panic arrives instantly. Only thirty minutes later does he understand the elevation was simply altitude. The body had been fine all along; the number had not let it stay that way.
For millions of wearers, smartwatches deliver exactly what they promise: reassurance and a sense of control. But for those already prone to anxiety, the constant stream of vital data has become something else entirely — a source of distress so acute that some have abandoned their devices altogether.
Neuroscience offers an explanation. The brain operates as a prediction machine, holding a continuous internal model of how the body should behave. When a watch displays a number that contradicts that model — an unexpected heart rate, a poor sleep score — the brain registers a prediction error. Normally, the body resolves such mismatches quietly. But data on a screen carries an authority that internal sensation does not, and so the mind begins to worry even when the body feels fine.
Anxiety disorders sharpen this dynamic considerably. People who already scan their bodies for threat find the watch amplifies that tendency into a self-sustaining loop: checking raises anxiety, and anxiety demands more checking. The COVID-19 pandemic made this pattern visible at scale, as obsessive temperature monitoring among anxious individuals became a source of fear rather than comfort. A study of around 500 smartwatch users confirmed it — those who felt uneasy without their device experienced sharp spikes in worry whenever the data looked unusual. For people with eating disorders, the risk takes a different shape: activity and calorie tracking can quietly reinforce compulsion rather than support health.
The picture is not entirely bleak. For many, these devices genuinely motivate and reassure. The difference, experts say, lies in moderation. Their suggested test is simple: remove the watch for a day, silence the notifications, and pay attention to what the body actually feels like without a screen translating sensation into data. The answer that emerges — relief or indifference — tends to clarify whether the device has been serving the person, or the other way around.
A man finishes a long walk feeling fine. His body feels good. His breathing is steady. Then he glances at his smartwatch and sees his heart rate: 130 beats per minute. Within seconds, the calm dissolves. Panic floods in. Thirty minutes later, he realizes the elevation was simply the altitude of where he'd been walking. The physical cause was harmless. The psychological damage, though, had already taken hold.
This is not an isolated incident. Millions of people wear smartwatches to track their steps, monitor sleep quality, and watch their heart rates in real time. For many, these devices deliver exactly what they promise: reassurance, data, control. But for others—particularly those already prone to anxiety—the constant stream of vital information has become a source of genuine distress. Some have abandoned their devices entirely, unable to tolerate the stress the numbers create.
Neuroscientists have begun to understand why. The human brain operates as a prediction machine, constantly building an internal model of how the body should behave. Throughout the day, you carry an expectation of what your heart rate should be, how your breathing should feel, what normal looks like. When a smartwatch displays a number that contradicts that internal model—a faster heartbeat, an irregular rhythm, a sleep score lower than expected—the brain registers what researchers call a prediction error. Normally, the body resolves these mismatches automatically and without conscious awareness. But smartwatch data arrives with the weight of objective truth. Numbers on a screen feel authoritative in a way internal sensations do not. So the brain gives them credence, and the mind begins to worry, even when the body feels perfectly fine.
This pattern affects people with anxiety disorders most acutely. They already tend to focus intensely on their own bodily signals, scanning for threats. A smartwatch amplifies this natural tendency into something more destructive. The device becomes both the object of worry and the tool for monitoring that worry. Checking the watch more often raises anxiety. Raised anxiety makes you check more often. The cycle feeds itself. During the COVID-19 pandemic, researchers observed this dynamic clearly: anxious individuals measured their temperatures obsessively, seeking reassurance through data, only to find that the constant monitoring itself became a source of fear. A study of roughly 500 smartwatch users confirmed the pattern. Those who felt dependent on their devices—who felt anxious when they forgot to wear them—experienced sharp spikes in worry whenever the data looked unusual.
The stakes extend beyond simple stress. For people with eating disorders, obsessive monitoring of calories burned and activity levels can reinforce harmful behaviors. The device becomes a tool for compulsion rather than health.
Yet the picture is not uniformly dark. For many people, smartwatch data genuinely provides comfort and motivation. The difference lies in moderation. Experts draw a line between mindful monitoring and obsessive tracking, and they suggest a simple test for anyone who suspects they've crossed it: turn the device off for a day. Hide the notifications. Stop looking at the numbers. Pay attention instead to what your body actually feels like, without technological intermediaries translating sensation into data. For some, this break will reveal that the watch was creating problems rather than solving them. For others, it will simply clarify the boundary between useful information and compulsive checking. Either way, the recommendation is the same: trust your body first. Let the numbers serve you, not the other way around.
Notable Quotes
The brain generates a prediction error when device data contradicts internal expectations, initiating an involuntary cycle of worry even when the person feels physically well— Neuroscience researchers cited in the article
The threshold between care and obsession lies in moderation; excessive monitoring can become harmful, particularly for people with eating disorders— Health experts quoted in the article
The Hearth Conversation Another angle on the story
Why does a number on a screen feel more real to someone than what they're actually experiencing in their body?
Because the brain trusts external data more than internal sensation. Your body is always sending signals, but they're ambiguous—a fast heartbeat could mean exercise, caffeine, emotion, altitude. A number seems to cut through that ambiguity. It feels objective. So even when you feel fine, the number can override that feeling.
But couldn't the same device help someone who's worried about their health?
Absolutely. For people without anxiety disorders, that's exactly what happens. The data reassures them. They see their heart rate is normal and they relax. The problem emerges when someone is already scanning their body for threats. The device becomes a weapon they use against themselves.
So it's not the smartwatch that's the problem—it's the person using it?
Not quite. The device is designed to be checked constantly. It's designed to alert you. For someone with anxiety, that design is a trap. The watch itself is neutral, but the interaction between the device and a vulnerable mind creates something harmful.
What happens if someone just stops wearing it?
Some people feel immediate relief. Others feel anxious about not knowing their data. The real solution isn't usually to quit entirely—it's to change the relationship. Check less often. Turn off notifications. Use it as a tool, not a mirror you're staring into all day.
Is this a new problem, or have people always done this with health data?
People have always worried about their health. But smartwatches made the data constant and portable. Before, you'd see your heart rate at a doctor's office once a year. Now it's on your wrist every second. The technology amplified something that was already there.