Why Does Anxiety Give You a Stomach Ache and Make Your Chest Tight?

Anxiety doesn't only happen in your thoughts. You may notice it in your stomach, your chest, your breathing, your muscles, or even in the way your heart beats.

Maybe your stomach starts to hurt before an important meeting. Perhaps you feel nauseated when you're worried about something. Or you notice a tight feeling across your chest when your mind won't stop racing.

These physical sensations are real. They are not “all in your head.”

Anxiety involves both the brain and the body, and the two are constantly communicating. Understanding that connection can make these symptoms feel less mysterious and can also help you recognize when it may be time to seek support.

Why Does Anxiety Affect Your Body?

Anxiety is part of the body's threat-detection system. When your brain perceives danger, uncertainty, or significant stress, it can activate physiological systems that prepare you to respond.

Your autonomic nervous system plays an important role in this process. Changes in heart rate, breathing, muscle activity, attention, and digestion can all occur when your body is responding to perceived threat.

The important point is that your body does not necessarily distinguish perfectly between a physical danger and a situation that feels psychologically threatening. A difficult conversation, an upcoming appointment, financial uncertainty, relationship problems, or a frightening thought can all produce genuine physical changes.

That does not mean every physical symptom is caused by anxiety. Physical symptoms have many possible causes, which is why persistent, severe, new, or unexplained symptoms deserve appropriate medical attention.

But when anxiety is part of the picture, the connection between emotional distress and physical sensations can be surprisingly powerful.

Why Does Anxiety Cause Stomach Aches?

One of the clearest examples of the brain-body connection is the relationship between anxiety and the digestive system.

Your brain and gastrointestinal system communicate continuously through what researchers often describe as the gut-brain axis. This communication involves the nervous system, immune system, hormones, and other biological pathways. It is also a two-way relationship: psychological distress can affect gastrointestinal symptoms, while gastrointestinal problems can influence psychological wellbeing (Zia et al., 2022).

That helps explain why your stomach can react when you're anxious.

You might experience cramping, nausea, bloating, changes in appetite, diarrhea, constipation, or the sudden urge to use the bathroom. For some people, anxiety can make an existing gastrointestinal condition feel worse. Research on disorders of gut-brain interaction has found meaningful associations between psychological factors and abdominal pain and other gastrointestinal symptoms (Zia et al., 2022).

You may have experienced this yourself. You are nervous about something, and suddenly you need to find a bathroom. Or you are going through a stressful period and realize that your stomach has been unsettled for days.

That response is not imaginary. Your digestive system is responding to what is happening throughout your body.

What About the “Knot in Your Stomach”?

Anxiety can also change how closely you pay attention to what's happening inside your body.

When you are worried, you may monitor yourself more carefully. A sensation you might normally ignore can suddenly become very noticeable. Once you notice it, you may start wondering what it means.

“Why does my stomach hurt?”

“Is something wrong?”

“What if this gets worse?”

For some people, this can create a feedback loop. The physical sensation creates worry, the worry increases attention to the sensation, and increased attention makes the sensation feel even more significant.

Research on interoception, which refers broadly to how we perceive and interpret signals from inside the body, suggests that the relationship between bodily sensations, attention, and interpretation is complex. It is not accurate to say that everyone with anxiety simply becomes “hypersensitive” to their body, but the way people notice and interpret physical sensations can contribute to distress (Wolters et al., 2022).

This is one reason anxiety can sometimes make ordinary bodily sensations feel frightening.

Why Does Anxiety Make Your Chest Feel Tight?

Chest tightness can be particularly unsettling because your chest is closely associated with breathing and your heartbeat. When something feels unusual there, it is understandable to become concerned.

Anxiety can affect breathing in several ways. Some people begin breathing faster, more shallowly, or with greater use of the muscles around the upper chest and shoulders. Changes in breathing can contribute to sensations such as breathlessness, dizziness, tingling, chest discomfort, or the feeling that you cannot quite get a satisfying breath (Leyro et al., 2021).

This can become especially noticeable during intense anxiety or panic.

And then another cycle can begin.

You notice that your breathing feels strange.

You become concerned that something is wrong.

Your attention turns even more strongly toward your breathing.

You may start taking repeated deep breaths or checking whether you can get a “full” breath.

The sensations become more noticeable, which can increase the fear.

This does not mean that anxiety is causing imaginary symptoms. It means that breathing, bodily sensations, attention, and anxiety can influence one another.

Muscle Tension Can Play a Role Too

Anxiety can also be associated with increased muscle tension.

When you are stressed, you may unconsciously brace your shoulders, jaw, neck, upper back, or chest. If that tension continues for hours or days, it can contribute to soreness, pressure, stiffness, headaches, and other uncomfortable sensations.

You may even find yourself taking a deep breath and thinking:

“Why can't I seem to get a satisfying breath?”

That feeling can be very real. Breathing-related symptoms associated with anxiety and dysfunctional breathing can include breathlessness, chest discomfort, dizziness, and tingling (Leyro et al., 2021).

At the same time, breathing difficulties and chest symptoms have many possible medical causes. Anxiety should not automatically be assumed to be responsible.

Anxiety Symptoms Are Real, But They Aren't Always Caused by Anxiety

This is an important distinction.

It can be reassuring to understand how anxiety can affect the stomach and chest, but that understanding shouldn't become a reason to dismiss physical symptoms.

If you have new, severe, persistent, or unexplained chest pain, significant difficulty breathing, fainting, unusual weakness, or other concerning symptoms, seek medical assessment. Similarly, severe or persistent abdominal pain, vomiting, bleeding, unexplained weight loss, or significant changes in bowel habits should be discussed with a healthcare professional.

Once physical causes have been appropriately assessed, you can begin looking at whether anxiety, stress, or another psychological factor may be contributing to what you are experiencing.

That process can be especially important when symptoms keep returning during periods of stress.

What Can Help When Anxiety Shows Up in Your Body?

There is no single technique that works for everyone, but learning how to respond differently to anxiety can reduce the cycle between physical sensations and fear.

Gentle breathing exercises can be useful for some people, particularly when breathing changes are part of their anxiety. Research suggests that interventions targeting breathing can reduce anxiety symptoms, although they are generally best understood as one possible component of anxiety treatment rather than a universal solution (Leyro et al., 2021).

It can also help to notice what your body is doing without immediately treating every sensation as a sign of danger. You might recognize that your shoulders are tense, unclench your jaw, change positions, take a short walk, or simply give yourself a moment to slow down.

Grounding can also bring your attention back to the present moment. Rather than repeatedly checking your body for signs that something is wrong, you might notice what you can see, hear, feel, or smell around you.

And sometimes the most useful question isn't “How do I make this sensation disappear?”

It is:

“What happens when I stop treating this sensation as an emergency?”

That is something you can explore in therapy.

How Can Therapy Help With Physical Anxiety Symptoms?

When anxiety repeatedly shows up as stomach problems, chest tightness, racing thoughts, or other physical symptoms, it can be tempting to focus only on getting rid of the sensations.

Therapy can help you look at the bigger picture.

You might explore what situations tend to trigger your anxiety, what you tell yourself when physical symptoms appear, whether you have begun avoiding certain situations, and whether worrying about your body has itself become part of the problem.

Cognitive behavioural therapy (CBT), for example, has strong evidence for a range of anxiety disorders. A large 2025 series of meta-analyses found meaningful benefits of CBT across several anxiety disorders, including generalized anxiety disorder, panic disorder, and social anxiety disorder (Cuijpers et al., 2025). Research specifically examining generalized anxiety disorder also supports CBT as an important first-line psychological treatment (Papola et al., 2024).

Therapy isn't about convincing yourself that physical symptoms aren't real.

It is about understanding the relationship between your thoughts, emotions, behaviours, and physical sensations, and developing ways of responding that don't allow anxiety to take over your life.

You Don't Have to Ignore What Your Body Is Telling You

Learning about the physical side of anxiety can be reassuring, especially if you've ever wondered why emotional stress can leave you feeling physically unwell.

Your stomach can react to stress. Your breathing can change. Your muscles can tense. Your heart can race. Your body and mind are not separate systems operating independently of one another.

At the same time, listening to your body also means knowing when something deserves medical attention.

Once you've ruled out an underlying medical problem, therapy can help you understand why anxiety may be showing up physically and how to respond when it does.

At Authentic Living London, our therapists provide supportive counselling for anxiety and related concerns. Therapy can offer a space to understand your anxiety, recognize the patterns that keep it going, and develop practical strategies for feeling more comfortable and confident in your own body.

Have a hard time making phone calls? That's ok. You are more than welcome to contact us via text. 226-224-0301

Gabrielle Ferguson, RP, BA, MACP is the founder of Authentic Living London and along with providing virtual psychotherapy sessions, she also provides keynote speaking and workshops on grief literacy.

References

Cuijpers, P., Harrer, M., Miguel, C., Ciharova, M., Papola, D., Basic, D., Botella, C., Cristea, I. A., de Ponti, N., Donker, T., Driessen, E., Franco, P., Gómez-Gómez, I., Hamblen, J., Jiménez-Orenga, N., Karyotaki, E., Keshen, A., Linardon, J., Motrico, E., Matbouriahi, M., Panagiotopoulou, O. M., Pfund, R. A., Plessen, C. Y., Riper, H., Schnurr, P. A., Sijbrandij, M., Toffolo, M. B. J., Tong, L., van Ballegooijen, W., van der Ven, E., van Straten, A., Wang, Y., & Furukawa, T. A. (2025). Cognitive behavior therapy for mental disorders in adults: A unified series of meta-analyses. JAMA Psychiatry, 82(6), 563–571. https://doi.org/10.1001/jamapsychiatry.2025.0482

Leyro, T. M., Versella, M. V., Yang, M.-J., Brinkman, H. R., Hoyt, D. L., & Lehrer, P. (2021). Respiratory therapy for the treatment of anxiety: Meta-analytic review and regression. Clinical Psychology Review, 84, 101980. https://doi.org/10.1016/j.cpr.2021.101980

Papola, D., Ostuzzi, G., Tedeschi, F., Gastaldon, C., Purgato, M., Del Giovane, C., Pompoli, A., Pauley, D., Karyotaki, E., Sijbrandij, M., Furukawa, T. A., Cuijpers, P., & Barbui, C. (2024). Psychotherapies for generalized anxiety disorder in adults: A systematic review and network meta-analysis of randomized clinical trials. JAMA Psychiatry, 81(3), 250–259. https://doi.org/10.1001/jamapsychiatry.2023.3971

Wolters, C., Gerlach, A. L., & Pohl, A. (2022). Interoceptive accuracy and bias in somatic symptom disorder, illness anxiety disorder, and functional syndromes: A systematic review and meta-analysis. PLOS ONE, 17(8), e0271717. https://doi.org/10.1371/journal.pone.0271717

Zia, J. K., Lenhart, A., Yang, P.-L., Heitkemper, M. M., Baker, J., Keefer, L., Saps, M., Cuff, C., Hungria, G., Videlock, E. J., & Chang, L. (2022). Risk factors for abdominal pain-related disorders of gut-brain interaction in adults and children: A systematic review. Gastroenterology, 163(4), 995–1023.e3. https://doi.org/10.1053/j.gastro.2022.06.028