How Stress Affects the Body

How Stress Affects the Body

Stress Facts

Understanding the mechanics of stress gives you the advantage of being more aware of and sensitive to your own level of stress and knowing when and how to take proactive steps. This increased awareness also helps you to better care for your family, friends and colleagues. Here are a few stress facts that many people are unaware of:

Fact #1: Your body doesn’t care if it’s a big stress or a little one.

The human body doesn’t discriminate between a BIG stress or a little one. Regardless of the significance, stress affects the body in predictable ways. A typical stress reaction, which most of us experience dozens of times each day, begins with a cascade of 1,400 biochemical events in your body. If these reactions are left unchecked we age prematurely, our cognitive function is impaired, our energy is drained, and we are robbed of our effectiveness and clarity.

Fact #2: Stress can make smart people do stupid things.

Stress causes what brain researchers call “cortical inhibition.” The phenomenon of cortical inhibition helps to explain why smart people do dumb things. Simply said, stress inhibits a small part of your brain and you can’t function at your best. When we are in coherence – a state where we are cognitively sharp, emotionally calm, and we feel and think with enhanced clarity – the brain, heart and nervous system are working in harmony. This state of coherence facilitates our cognitive functioning – we are actually operating at peak performance mentally, emotionally and physically.

Fact #3: People can become numb to their stress.

We can be physiologically experiencing stress yet mentally numb to it because we’ve become so accustomed to it. Some have become so adapted to the daily pressures, irritations and annoyances of life that it starts to seem normal. Yet the small stresses accumulate quickly and we may not realize how much they’re impairing our mental and emotional clarity and our overall health until it shows up as a bad decision, an overreaction or an unwanted diagnosis at the doctor’s office.

Fact #4: We can control how we respond to stress.

We don’t need to be victims to our own emotions, thoughts and attitudes. We can control how we respond to stress and we can become more sensitive to stressful situations and how they are affecting us before it manifests as a physical, mental or emotional complaint. There are simple, scientifically validated solutions to stress that empower people to rewire their own stress response.

Fact #5: The best strategy is to handle stress in the moment.

The best way to manage stress is to deal with it the very moment you feel it come up. Millions of Americans unsuccessfully use the binge-and-purge approach when it comes to stress. They stress out all day, believing that they can wait until later to recover when they go to an evening yoga class, go to the gym or chill out when they take the weekend off. Unfortunately, when we put off going for our own inner balance our bodies have already activated the stress response and it’s our health that suffers.


HeartMath’s research shows how emotions change our heart rhythm patterns. Positive emotions create coherent heart rhythms, which look like rolling hills – it’s a smooth and ordered pattern. In contrast, negative emotions create chaotic, erratic patterns. Using a heart rhythm monitor, you can actually see your heart rhythms change in real time as you shift from stressful emotions like anger or anxiety to positive feelings like care or appreciation. Coherent heart rhythm patterns facilitate higher brain function, whereas negative emotions inhibit a person’s ability to think clearly. Coherent heart rhythms also create a feeling of solidity and security.

A Science of Social Coherence: The Hidden Rhythm of Human Connection

What a February 27, 2026, Psychology Today article reveals about the science of coherence and harmony

Have you ever felt instantly “in sync” with someone—like the conversation just flows or a room seems to share the same emotional tone? In a recent Psychology Today article, psychiatrist Lawson Wulsin explores a compelling idea: that this sense of connection may not just be emotional—it could be physiological.

Drawing on the concept of mechanical coherence—where systems (think schools of fish, flocks of starlings) move as one—Wulsin reports on research that explains that we, too, may be wired to synchronize with one another.

This idea connects with what researchers call personal coherence—a state in which the heart, brain, and nervous system are working in sync. One of the most meaningful ways to observe this is through heart rate variability (HRV), a focus of research led by Rollin McCraty, PhD, at the HeartMath® Institute. When our HRV patterns are more ordered and harmonious, we often feel more centered, resilient, and emotionally balanced.

But what makes this especially compelling is how that inner harmony may naturally extend outward. Wulsin explores the emerging idea of social coherence—the possibility that our internal states can begin to align with those around us. In moments of genuine connection—whether in conversation, collaboration, or quiet presence—we may be doing more than relating emotionally. We may be tuning to each other, creating a shared rhythm that supports deeper communication, trust, and flow.

It’s a perspective that feels both intuitive and hopeful: that by cultivating coherence within ourselves, we may also help create more harmony in our relationships, teams, and communities.

Wulsin, Lawson. “A Science for Social Coherence?”, Psychology Today, February 27, 2026.

Summary: Stress in America™ 2025: A Crisis of Connection Report and Related National Polls

The American Psychological Association 2025 Stress in America report describes a growing “crisis of connection.” In a survey of more than 3,000 U.S. adults, 62% said societal division is a major source of stress, and about half reported feeling lonely. Those stressed by national division are significantly more likely to experience loneliness and related emotional strain. This disconnection is linked with poorer mental and physical health, including anxiety, depression, and physical stress symptoms such as fatigue and headaches.

Key Findings from the APA’s Stress in America 2025: A Crisis of Connection

  • Societal division is a major source of stress.
    62% of U.S. adults say division in the country is a significant stressor in their lives. Political polarization, cultural conflicts, and public discourse are not just frustrating—they are contributing to emotional strain and fatigue for many people.
  • Loneliness and disconnection are widespread.
    About half of adults report feeling emotionally disconnected at least some of the time.
    • 54% say they feel isolated from others.
    • 50% say they feel left out.
    • 50% report lacking companionship.
      These responses suggest that loneliness has become a common experience for many Americans.
  • Division appears to deepen loneliness.
    Adults who say societal division is a major source of stress are significantly more likely to feel isolated.
    • 61% of those stressed by division report feeling isolated often or sometimes.
    • This compares with 43% among those who do not see division as a major stressor.
      The findings suggest that living in a divided environment can intensify feelings of emotional separation.
  • Loneliness is linked with declining health and well-being.
    People who report high levels of loneliness are more likely to experience chronic health conditions and mental health challenges.
    • 80% of adults with high loneliness say they live with chronic illness.
    • This compares with roughly two-thirds of adults with moderate or low loneliness.
      Common related conditions include depression, anxiety disorders, and chronic pain.
  • Stress from societal division also shows up physically.
    Among adults who report high stress from national division:
    • 83% experienced at least one physical symptom of stress in the past month.
    • Common symptoms include nervousness or anxiety (42%), fatigue (40%), and headaches (39%).
      These rates are substantially higher than among people who are not significantly stressed by societal division.
  • Concern about the country’s future is widespread.
    About three-quarters of adults say they are more stressed about the nation’s future than in previous years.
    Many also identify the future of the country as a major ongoing stressor.
  • Younger adults and parents report particularly strong reactions.
    Nearly two-thirds of adults ages 18–34 and more than half of parents say they have considered moving to another country due to concerns about the nation’s direction.
  • New stressors are emerging alongside traditional ones.
    Anxiety about misinformation and the rapid rise of artificial intelligence has increased significantly.
    • 69% report stress about misleading information.
    • 57% report stress related to AI, with even greater concern among younger adults and workers.
  • Despite these pressures, resilience remains strong.
    While many adults report obstacles and uncertainty, a large majority still believe they can build meaningful lives and help shape the future of the country.
    Hope, agency, and a sense of responsibility continue to coexist alongside stress and division.

Full report:
https://www.apa.org/pubs/reports/stress-in-america/2025

Next Level Human Podcast

(hosted by Jade Teta)

Deborah Rozman: A Heart-Brain Tweak Your Listeners Can Try

Unlock the secret link between your heart and mind that can transform stress into resilience, clarity, and even elevate your spiritual connection. If you’ve ever wondered how your emotional states literally shape your health and your thoughts, this episode is your essential guide. Deborah Rozman, PhD, co-CEO of HeartMath Incorporated, reveals groundbreaking insights into how your heart’s electromagnetic field influences every cell in your body—and how cultivating heart coherence can rewire deep-seated beliefs and emotional patterns.

Go to the podcast page

The Tonic Podcast

Hosted by Jamie Bussin

Howard Martin: Why Outrage Is Biological — And How to Change It.

Topics covered on the show track the lifestyle articles and themes published in The Tonic Newsletter and on the Tonic Website. We’ll discuss supplements for an active healthspan with nutraceutical formulator Dr. Gordon Chang PhD, perimenopause and heart health with cardiologist Dr. Nisha D’Mello MD, the top tips to beat sleep loss with neurodesign expert Rachel Melvald, and the physiological impact of stress with health executive Howard Martin.

The Physiological Impact of Stress

  • Stress comes from external events and from emotional response from within
  • We live in a high stress era
  • Are we resilient?
  • How does stress manifest physiologically?
  • Build a baseline resilience
  • A demonstration of a quick coherence technique
  • How to utilize the technique
  • Meditation

Go to Podcast

NBC Las Vegas with Howard Martin: What we can do to help reduce war anxiety.

Howard Martin:  What we can do to help reduce war anxiety.

Howard Martin, executive vice president at HeartMath, said he has “never seen the stress levels as high as they are today,” pointing to the combination of personal pressures and global events.

“It can bring up stressful feelings and anxiety,” Martin said, adding that repeated exposure to war-related images can intensify those feelings, especially when people may only be seeing “a part of the total picture.”

Visit NBC Las Vegas

The Healing Power of Love: How the Heart Supports Emotional and Physical Healing

Sometimes healing begins with a pause—a gentle shift in attention, a moment when we choose to reconnect with our deeper heart. Not just the physical organ, but the inner place where love, compassion, and wisdom live. Across cultures, spiritual traditions, and, recently, more than 30 years of scientific research, this deeper heart has been validated as a powerful source of emotional and physical healing. 

When Love Awakens the Heart

There are times when life’s hurts, stress, or loss can leave us feeling closed, guarded, or depleted. Yet many people describe a turning point when they feel a quiet nudge from within—a sense of being called back to love. This may show up as a desire to forgive, a surprising wave of compassion, or a renewed longing to live with more kindness and authenticity.

Modern research is beginning to map what wisdom traditions have pointed to for centuries: When we genuinely experience feelings like compassion, appreciation, or love, our heart rhythms shift into a more ordered, coherent pattern. HeartMath’s findings suggest that warmhearted emotions—like love, compassion, gratitude, and kindness—are the “magic ingredients” for creating a state of heart-brain coherence, which supports calmer emotions, clearer thinking, and a physical body that can repair and regenerate more effectively. The physiological state of heart-brain coherence has also been found to act as a bridge to a higher intuitive or “quantum” intelligence within, allowing the natural healing power of love to more actively guide, restore, and realign our mental, emotional, and physical natures.  

How Heart-Focused Love Supports Healing

Heart-focused practices are simple, yet they can touch us deeply. Sitting quietly, focusing our attention on the area of our heart, breathing a little slower and deeper than usual, and bringing to mind someone or something we love or appreciate can begin to synchronize our heart’s rhythm and align our heart, brain, and nervous system. As the heart’s rhythm becomes more coherent, signals sent to the brain help reduce stress responses and invite a state of safety, balance, and openness.

Over time, this loving connection with the warmth of the heart can loosen the grip of old emotional patterns, soften self-judgment, and ease the body’s load. 

People often report feeling more present, more connected, and better able to navigate pain or challenges without becoming overwhelmed. In relationships, this inner shift shows up as more patience, deeper listening, and a greater capacity to remain centered and kind—even when things are difficult. From individuals and families to schools, first responders, and community organizations, heart-focused tools and practices are helping more and more people shift from reactive stress to inner calm, where wise choices and compassionate actions emerge more naturally. 

Love as a Daily Healing Practice

The healing power of the heart can be woven into the small choices of daily life: 

  • Taking a brief pause before a tough conversation to breathe through the heart and invite a feeling of love can shift our perception and understanding in that moment. 
  • Sending a quiet intention of compassion to someone who is struggling can release anxiety and stress. 
  • Remembering to appreciate the people and things we value in the midst of busy days can help us find more ease and flow through situations.  

Each time we choose to pause in the moment and shift to the heart, it strengthens a new inner pattern of awareness that love is an active, healing force within us. As we connect with this power of the heart, we may find that we are not just coping with life better—we are slowly being reshaped from the inside out and awakening who we truly are. 

At a larger scale, research is beginning to explore how our emotions and intentions affect not only ourselves, but others and even the wider field of human connection. Choosing to live from the heart is both personal medicine and a gift to the world. The more we allow love to move through us—in our thoughts, feelings, and actions—the more we participate in a field of healing that extends far beyond ourselves.  

Attitude Breathing: A 3-Minute Reset for Your Heart

A technique that will help you move from depleting emotions to renewing emotions.

Stress doesn’t just live in your mind—it shows up in your heart rhythms, your breathing, and your body’s ability to recover.

The good news: Short, simple practices can help your system reset, even on busy, stressful days.​

Here is the 3-minute heart reset called “Attitude Breathing,” excerpted from The HeartMath Experience program.   

ATTITUDE BREATHING™
Start by pausing to pay attention to what you are feeling now, or today—feelings that you would like to shift (frustrated, judgmental or self-critical, down/sad, angry, etc.).

STEPS:

  1. Recognize the feeling or attitude you would like to change and what you would rather feel—a feeling you’d like to replace it with. Examples:
    1. You are feeling stressed…you’d rather feel calm.
    2. You’ve been feeling overloaded…you want to replace it with a feeling of ease.
    3. Feeling judgmental? Consider replacing it with kindness or compassion.
  2. Practice heart-focused breathing.
    1. Focus your attention on the area of your heart.
    2. Imagine your breath is flowing in and out of your heart/chest area—breathing a little slower than usual.
  3. Practice breathing in your new replacement attitude.
    1. Stay with it until you start to feel the shift.
  4. Anchor and maintain the practice.
    1. Practice maintaining your new attitudes and perceptions as you move through your daily interactions. Commit to practicing once a day for the next few weeks to create a habit.

If you enjoyed this video, check out the full (free) HeartMath Experience program here.

Gratitude: The Feeling Your Heart Loves

“Gratitude has been really helpful for me — whenever I start to have a negative feeling or go into that kind of ruminating spiral, I just look around and say, ‘What can I be grateful for?’ I can just look at my hand and appreciate that I have fingers that move. 

And it immediately stops the negative flow from happening, that spiral of rumination… It puts it on pause. 

And then, you can try to go in that positive direction. 

Look at the light bouncing off the leaves on that tree. Look at the way it’s swaying in the wind. 

And then, already, you’re on the right path. No matter where I am, I can pull out my gratitude card.”

Louie Schwartzberg

Recent Studies Show HRV Coherence Biofeedback Helps the Heart Stay Resilient Under Stress

HeartMath Institute researchers have received many thousands of citations and are considered pioneers in heart-brain interactions and heart rate variability. Their research led to practical tools that improve emotional regulation, resilience, and ease stress, anxiety, and depression.

In 2025, over 20 new independent research papers were published based on HeartMath research and HRV coherence training technology. Here are a few examples:

1. A clinical study published in JAMA Network Open found that Heart Rate Variability Coherence Biofeedback can help the heart respond more effectively during mental or emotional stress—especially for people with coronary artery disease.

Heart Rate Variability Biofeedback and Mental Stress Myocardial Flow Reserve: A Randomized Clinical Trial

Amit J. Shah, Paolo Raggi, Hua She, AA Quyyumi, O Levantsevych, M Johnson, et al.
JAMA Network Open, Vol. 8 (10), p. e2538416

2. Another study published in Physiological Reports found that in healthy young adults, brief use of HeartMath techniques increased HRV markers linked to improved autonomic flexibility, suggesting these techniques can quickly enhance cardio-autonomic balance and support stress-resilience training.

Heart‐focused breathing technique and attitude breathing technique effects on heart rate variability in young healthy subjects

Ilinca Savulescu‐Fiedler, Sandica Bucurica, Ioana Toader, Constantin Pistol, Ionela Maniu
Physiological Reports, Vol. 13 (21), p. e70589

3. This Phase II trial tested HRV biofeedback alongside standard care in Long COVID-related ME/CFS (myalgic encephalomyelitis/chronic fatigue syndrome). HRV coherence training reduced fatigue and autonomic symptoms, improved sleep, and quality of life versus controls, suggesting a safe and promising adjunctive therapy.

The Use of Heart Rate Variability-Biofeedback as an Adjunctive Intervention in Chronic Fatigue Syndrome in Long COVID: Results of a Phase II Controlled Feasibility Trial

Giulia Cossu, Goce Kalcev, Diego Primavera, Stefano Lorrai, Alessandra Perra, Alessia Galetti, Roberto Demontis, et al. 
Journal of Clinical Medicine, Vol. 14 (15), p. 5363

4. A functional medicine clinic implemented virtual HRV biofeedback in an interdisciplinary protocol for chronically ill patients. It showed clinical improvements in symptoms, autonomic function, and well-being after training.

Clinical Implementation of a Virtual Heart Rate Variability Biofeedback Training as Part of a Functional Medicine-Based Interdisciplinary and Integrative Intervention for Chronically Ill Veterans

K. Haws, C. Carlson, S. Greer, P. McManus, E. Sacra, C. Kussin, S. Mak, H. Chandler, O. Osinubi
Institute for Functional Medicine

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The Heart of a Champion: Iga Świątek

As part of the exclusive Rolex documentary series, Mind of a Champion, Iga Świątek reveals how continuously refining her mental game—including the use of HeartMath’s Inner Balance™ technology—helps her perform under the intense pressure that comes with being a top tennis player. The film offers a rare glimpse into her mindset, discipline, and the heart-focused techniques that keep her grounded and effective on the court.

Iga is now ranked No. 2 in the WTA (Women’s Tennis Association), including winning Wimbledon in July 2025 and securing her sixth Grand Slam title: 

  • French Open: 4 titles (2020, 2022, 2023, 2024)
  • US Open: 1 title (2022)
  • Wimbledon: 1 title (2025, her first on grass)​

These six majors make her the only active woman with Slam titles on clay, hard, and grass courts, having won three different majors. 

Congratulations to Iga on a phenomenal season—we look forward to watching her continued success this year!

Watch the documentary clip: https://www.youtube.com/watch?v=qfK-Lh4MDmg.