Guide · Research

Breathing and Panic: What the Research Says

By Vernon B · Reviewed and edited by Vernon B · Updated November 2, 2026

By Vernon B · Help My Attacks · Peer support, not medical advice

"Just take a deep breath." If you live with panic, you've probably heard it a hundred times, often from someone who loves you. Maybe you tried it, gulped in a big breath, and felt worse. Dizzier. More short of air. More scared.

You weren't doing it wrong. Breathing and panic have a more complicated relationship than that advice suggests. We're a peer-support community, not doctors, so we read what health agencies and published studies say and link every number to its source, including the parts that are still uncertain.

What breathing has to do with panic

The National Institute of Mental Health (NIMH) lists difficulty breathing, weakness or dizziness, and tingly or numb hands among the physical symptoms. Mayo Clinic lists shortness of breath or tightness in your throat, along with dizziness and numbness or tingling. The NHS includes shortness of breath, a choking sensation, and pins and needles.

Mayo Clinic explains that in real danger, your heart rate and breathing would speed up, and many of the same reactions happen during panic, with no danger around.

Overbreathing and carbon dioxide, in plain language

MedlinePlus, from the US National Library of Medicine, describes hyperventilation as rapid and deep breathing, and explains that excessive breathing creates a low level of carbon dioxide in your blood, which causes many of its symptoms. Those include lightheadedness, feeling like you can't catch your breath, a pounding heartbeat, and tingling around the mouth. It also notes that you might not be aware you're breathing fast and deep, even while you notice everything else.

So the cruel loop goes something like this: you feel short of breath, you breathe harder to fix it, carbon dioxide (CO2) drops, and the dizziness and tingling get stronger, which feels like proof that something is wrong.

Researchers who study this note that hyperventilation can mean either fast or deeper breathing, or a combination of both. Some people with panic seem to breathe this way even at rest. In a small 2001 study where people sat quietly for 30 minutes, the 16 with panic disorder sighed more and had lower end-tidal CO2 than 19 people without anxiety.

But we don't want to oversell this. Scientists still debate whether low CO2 drives panic or is more of a side effect. A 2010 review summed up two competing theories, one where overbreathing produces the feared symptoms and one where it guards against a feared sense of suffocation, and concluded that the evidence for both theories is inconclusive. In a 2008 study where people deliberately overbreathed in the lab, the differences between people with panic and people without it showed up mostly in the cognitive-language rather than in the physiological realm. How people read the sensations mattered a lot.

Why "take a deep breath" can backfire

If big, deep breaths can lower CO2, then telling someone mid-panic to breathe deeply can add fuel. The 2010 review by Alicia Meuret and Thomas Ritz says instructions like "Take a deep breath!" or "Breathe deeply!" can only exacerbate hypocapnia (low CO2) and related symptoms. The same review points out that even common advice to breathe slower may lead some people to compensate by breathing deeper.

When Southern Methodist University described Meuret's research, it put it plainly: the goal was breathing slower but, most importantly, more shallowly, and "Contrary to lay belief, taking deep breaths actually worsens hyperventilation and symptoms." That's a news release about one research program, so we hold it a little loosely.

That doesn't mean "never breathe deeply." The NHS exercise invites breath as deep down into your belly as is comfortable, without forcing it. The difference seems to be gentle and unhurried versus big and gulping. If an instruction makes you more lightheaded, that's information, not failure.

Capnometry-assisted respiratory training (CART)

In capnometry-assisted respiratory training, people use a handheld device that reads the CO2 in their breath, so they can see in real time whether their breathing is pulling it down. In their 2008 trial, 37 people with panic disorder were randomly assigned to the training or to a waitlist. The program was four weeks long, with five weekly 1-hr treatment sessions and twice-daily 17-minute practice sessions at home. Trained patients improved in panic severity, avoidance, and fear of body sensations, and improvements were maintained at follow-up at 2 and 12 months. A later paper summarizing that trial reported that 68% of patients had clinically significant reductions in panic symptom severity right after treatment. The authors themselves called this preliminary evidence needing replication.

In a 2010 trial, 41 people with panic disorder and agoraphobia got four weeks of either CART or cognitive training, which works on frightening thoughts about symptoms. Panic severity dropped in both groups, and the improvements were significant and comparable in both treatment groups. Only the breathing group moved from low CO2 into the normal range, suggesting the two help through different pathways.

A 2017 study tested a commercial version of this approach in four everyday (non-academic) clinics with 69 adults. It reported an intent-to-treat response rate of 83% and a remission rate of 54%. But the authors noted that the primary limitation of the present trial is the absence of a control group, and the study was funded by the company that makes the device.

A plot twist: is it the CO2 at all?

In a 2012 Stanford trial, 74 people with panic disorder were randomly assigned to one of two opposite breathing trainings using the same kind of CO2 feedback. One group learned to raise their CO2. The other learned to lower it. Both groups improved a lot, with effect sizes at one month of 1.34 for the raise-CO2 group and 1.53 for the lower-CO2 group, and gains held at six months.

If opposite goals helped about equally, CO2 probably wasn't the main ingredient. The authors pointed instead to changed beliefs and expectancies, exposure to ominous bodily sensations, and attention to regular and slow breathing.

A 2018 analysis of 35 people doing CO2-raising exercises points the same way. Breathlessness went up during the exercises, and greater dyspnea was related to significantly lower panicogenic cognitions over time, meaning fewer panic-feeding thoughts. Part of the benefit may come from sitting with the scary sensation and learning it passes.

Breathing retraining inside CBT: what dismantling studies found

Cognitive behavioral therapy (CBT) is the best-studied talk therapy for panic. NIMH calls it the "gold standard" choice for psychotherapy and notes that exposure therapy may be used along with relaxation exercises and breathing training techniques. Researchers have run "dismantling" studies, taking CBT apart to see which pieces carry the weight.

• Breathing retraining vs facing body sensations. In a 1997 study of 38 people with panic disorder and agoraphobia, both versions of CBT helped on many measures, but the version with interoceptive exposure (practicing the feared body sensations on purpose) was more effective at post-treatment in terms of panic frequency, severity, and functioning than the version with breathing retraining.
• CBT with or without breathing retraining. In a 2000 trial of 77 people, adding breathing retraining didn't clearly add anything. The authors wrote that some data suggested that the addition of BR yielded a poorer outcome, though results were generally more consistent with the two treatments being equal.
• The big-picture analysis. A 2018 review pooled 72 studies with 4,064 participants. Interoceptive exposure and face-to-face therapy were linked with better results, while breathing retraining appeared to improve treatment acceptability while having small effects on efficacy.

We read that kindly: breathing tools may make therapy feel more doable, which matters, but they don't seem to be the main driver. The 2000 trial's authors also worried that breathing retraining can be a more attractive (but less adaptive) option for some people, something to cling to rather than a skill for riding the wave. Our CBT research guide goes deeper.

What the slow-breathing meta-analyses say

Beyond panic disorder, there's growing research on slow breathing for stress and anxiety in general:

• Breathwork and stress. A 2023 meta-analysis of 12 randomized trials with 785 adults found breathwork was linked with lower stress than control conditions, a significant small-to-medium mean effect size (g = -0.35). Results for anxiety (20 studies) were similar. The authors also urged caution to avoid a miscalibration between hype and evidence.
• Slow breathing and the heart. A 2022 review of 223 studies found voluntary slow breathing increases in vmHRV, a heart-rhythm measure tied to the body's "rest" system. The authors expected few adverse effects.
• Heart rate variability biofeedback. A 2017 meta-analysis of 24 studies with 484 participants found this slow-breathing-based training was linked with a large reduction in self-reported stress and anxiety, while noting that more well-controlled studies are needed.
• Long exhales. A 2023 Stanford study had 108 people practice one of several 5-minute techniques daily for a month. Exhale-focused "cyclic sighing" produced greater improvement in mood and a bigger drop in breathing rate than mindfulness meditation. Most participants were university students, and people with moderate to severe psychiatric conditions were excluded, so it isn't a panic disorder study.

What to do during a wave, based on all this

None of this is a prescription or a replacement for professional care. Here's how we, as peers, put it into practice:

• Go gentle, not big. Skip the giant gulps. The NHS suggests breathing in gently and regularly, and some people find it helpful to count steadily from 1 to 5, then let the breath flow out gently. You may not reach 5 at first, and that's okay.
• Let the exhale lead. For overbreathing, MedlinePlus describes pursed-lip breathing: puckering your lips as if blowing out a candle, then breathing out slowly through your lips. Our exhale longer post and hum on the exhale post are built around this.
• Practice when you're calm. The NHS notes you'll get the most benefit if you practice regularly, as part of your daily routine. A skill rehearsed on a quiet day is easier to find in a hard one.
• Breathe to ride it, not to escape it. Given the dismantling studies, it may help to treat breathing as a way to stay with the wave rather than a must-do ritual. If focusing on your breath makes things worse, it's fine to switch to something else, like our grounding guide or hand on your belly post.

The honest limits

• Small studies. Most CART trials had a few dozen people, from a handful of research teams.
• Mechanism is unsettled. The opposite-breathing trial suggests CO2 may not be the key ingredient.
• General vs panic populations. The breathwork meta-analyses mostly include people without panic disorder, and the 2023 review rated most studies as being at moderate risk of bias.
• Breathing isn't always panic. MedlinePlus lists medical causes of fast breathing too, including heart failure or heart attack, asthma, and pulmonary embolism.

When to get help

If you're having rapid breathing for the first time, MedlinePlus says it may be a medical emergency, and you should be taken to the emergency room right away. If breathing trouble is new, severe, or different from your usual pattern, please call 911. See our panic and chest pain guide too.

If panic or breathlessness keeps coming back, talk with a doctor or mental health professional. Mayo Clinic notes panic attacks are hard to manage on your own and may get worse without treatment. Ask whether CBT with interoceptive exposure is available to you.

If you ever feel unsafe or have thoughts of suicide, please reach out right away. In the US, you can call or text 988 to reach the Suicide & Crisis Lifeline.

If "just breathe" ever made you feel like you were failing at the simplest thing, you weren't. Your body was doing what alarmed bodies do. Gentler breathing and learning that the sensations pass are both real skills that take practice. We're practicing right alongside you.

References

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