Episode 180: Why Won't My Acid Reflux Go Away? The Vagus Nerve Connection

Acid reflux is often treated as an acid problem. Underneath, your nervous system is often the bigger driver. When your body senses threat, digestion is the first thing it sets aside. The lower esophageal sphincter loosens. The stomach empties slowly. Reflux follows.

This is the gut-brain connection behind stress and acid reflux. The vagus nerve runs between your brain and your gut. When the nervous system is dysregulated, that line goes quiet. For many people, reflux started or worsened after a time of high stress or trauma.

Registered dietitian Molly Pelletier specializes in the mind-gut connection. Her work centers on nervous system regulation and digestion. She walks through why reflux is a nervous system signal. And she shares the somatic tools that help calm it.

"My nervous system was playing a much bigger role in my reflux than I ever could have imagined."

— Molly Pelletier

An early read on your nervous system explains why reflux holds on. This episode covers reflux hypersensitivity, lost hunger and fullness cues, and the somatic tools that calm the gut, including diaphragmatic breathing after meals.

In This Episode You'll Learn:

• 01:40 — Why did you focus your work on reflux and the gut?

• 02:50 — What was the moment you realized your nervous system was driving it?

• 04:10 — Why is reflux an expression of your nervous system's health?

• 08:20 — Why is somatic work the missing link with reflux?

• 09:50 — What nutrition shifts actually help relieve reflux?

• 14:20 — What childhood patterns show up in stomach and reflux issues?

• 18:40 — Why can't some people feel when they are hungry or full?

• 23:20 — Which somatic tools help calm reflux?

• 27:00 — Which foods can trigger reflux during a healing phase?

• 31:20 — How do you know if reflux is affecting your sleep?

• 33:00 — What is the most important thing to walk away knowing?

Key Takeaways

• The nervous system controls digestion through the vagus nerve, the gut-brain highway

• Under threat, the body deprioritizes digestion and loosens the esophageal sphincter

• For many people, reflux started or worsened after high stress or trauma

• Reflux hypersensitivity makes normal acid levels feel intensely painful

• Chronic stress can keep the digestive system stuck in a survival state

• Many people cannot feel hunger or fullness, a sign of disrupted interoception

• Going too long without eating, then overeating, is a major reflux trigger

• Diaphragmatic breathing after meals can reduce reflux events

• People-pleasing and perfectionism often show up in gut and eating patterns

• Nocturnal and silent reflux can quietly disrupt sleep and the throat

• Small, consistent steps calm the nervous system and the gut over time

  
  

Notable Quotes

"The vagus nerve is the main highway of communication between the gut and the brain."

"When your nervous system is on high alert, your body deprioritizes digestion."

"Post-meal diaphragmatic breathing can reduce reflux events."

Episode Takeaway

What Molly shared adds another piece to what the body keeps telling us.

Reflux is often read as an acid problem. The body is telling a deeper story. When the nervous system senses threat, digestion is set aside. The vagus nerve pulls back. The sphincter loosens. The gut holds the state we are living in.

This is the pattern of dysregulation, and it shows up in the gut. For some, the body has crossed into a freeze response. In a stress state, digestion takes a strategic pause and recovers. Push past the body's limit, and it tips into dysfunction.

There is often grief and old programming underneath. The people-pleasing. The skipped lunch break. The belief that everything else matters more than your own body. These are survival patterns from early life, lived out at the dinner table.

This is the part I want you to hold. The gut settles as the nervous system learns it is safe. That safety grows through experience, repeated over time. That is where repair begins, one small, repeated practice at a time.

If you want to read your own state, my Stress or Trauma guide is a place to start. You can pair it with chapter 5 of The Biology of Trauma, on the whole-body experience of overwhelm.

Resources/Guides:

• Stress or Trauma? Read What Your Body Is Running (free): a Biology of Trauma® guide to tell whether your nervous system is running a stress response or a trauma response, and the sequence it needs next. 

• The Biology of Trauma: chapter 5, on the whole-body experience of overwhelm, including how the gut shifts under stress and trauma.

  
  

Related Podcast Episodes:

• EP 34: Polyvagal Lens on Attachment, Freeze and Functional Diseases with Dr. Stephen Porges

• EP 126: Neuroception Explained: How Your Nervous System Decides What's Safe and Why It Matters for Healing

• EP 178: Vagus Nerve and Vision: How Your Eyes Signal Safety to Your Nervous System

About the Guest: 

Molly Pelletier is a board-certified Registered Dietitian, MS, and the founder of FLORA Nutrition. She specializes in the mind-gut connection and nervous system regulation. Her work translates complex GI science into somatic tools for chronic digestive conditions like reflux, GERD, and IBS. She came to this work through her own experience with reflux and digestive issues.

Connect with Molly: Website: mollypelletier.com  ·  Instagram: @mollypelletier.rd

Your host: Dr. Aimie Apigian is a double board-certified physician in Preventive and Addiction Medicine, author of the national bestselling book The Biology of Trauma (foreword by Gabor Maté) and the founder of the Biology of Trauma^® framework that transforms our understanding of how the body experiences and holds trauma. She holds master's degrees in biochemistry and public health. After foster-adopting a child during medical school sparked her journey, she desperately sought for answers that would only continue as she developed chronic health issues. Through her Biology of Trauma^® practitioner training, podcast, YouTube channel, and international speaking, Dr. Aimie bridges functional medicine, attachment science, and trauma therapy — with a focus on facilitating accelerated repair of trauma's impact on the mind, body, and biology.

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Can stress and anxiety cause acid reflux?

Stress and anxiety move the nervous system into a survival state. Digestion slows, the esophageal sphincter loosens, and acid reflux becomes more likely.

Under stress, your body prepares to act. Blood moves to your limbs, away from your gut. Digestion is not the priority when the body senses threat. The stomach empties more slowly. Pressure builds, and acid can move upward.

Research backs this link. A large countrywide study found higher perceived stress in people with reflux symptoms. The connection runs both ways, since reflux can also raise anxiety.

How does the vagus nerve connect the gut and the brain?

The vagus nerve is the main highway between your brain and your gut. It carries the signals that set your digestion to rest or to brace for threat.

Your gut and brain talk constantly through the enteric nervous system. The vagus nerve is the main line. When vagal tone is strong, digestion runs smoothly. When the nervous system is dysregulated, that signal weakens.

The vagus nerve also helps control the lower esophageal sphincter. That small muscle keeps stomach contents where they belong. When the autonomic nervous system is off balance, the sphincter does not get the message to close.

Why does reflux get worse after stress or trauma?

After high stress or trauma, the nerves of the esophagus grow more sensitive. Even normal acid levels can feel intensely painful. This is reflux hypersensitivity.

Molly finds that most clients trace their reflux to a stressful or traumatic time. When the nervous system stays on alert, the esophagus and larynx grow hypersensitive. Normal reflux starts to feel severe. Reflux hypersensitivity is when the esophageal nerves become so sensitive that even normal acid feels painful.

There is a deeper layer here. In a stress state, digestion takes a strategic pause and recovers. Push past the body's limit, and it tips into dysfunction. The gut holds the state the body is living in.

Why can't I tell when I'm hungry or full?

When the body learns it is not safe, it can mute internal signals. Many people lose the ability to feel hunger and fullness clearly. This is disrupted interoception.

Molly sees this pattern often, and it is a major reflux trigger. People go too long without eating, then eat a very large meal. The body never got the early hunger cue, so the meal overwhelms the system. Interoception is the body's ability to sense internal signals like hunger, fullness, and thirst.

Dr. Aimie connects this to early neurodevelopment in the brainstem. Hunger, thirst, and fullness signals can be faint when that wiring formed under stress. The signal may arrive as fatigue, irritability, or a headache instead.

Does diaphragmatic breathing help acid reflux?

Yes. The diaphragm is part of the anti-reflux barrier. Slow diaphragmatic breathing after meals can strengthen it and reduce reflux events, with support from clinical research.

Molly teaches two simple practices that calm the nervous system and support digestion:

1. The LES lock method — one to five minutes of diaphragmatic breathing after meals.

2. Nervous system snacks — short one to five minute grounding breaks placed through the day.

   
   

The LES lock method strengthens the diaphragm around the esophageal junction. It also shifts the body into the rest-and-digest state.

A randomized controlled study found breathing training reduced acid exposure and medication use. The diaphragm and the lower esophageal sphincter work together as one barrier.

What foods can trigger acid reflux?

Some foods can loosen the esophageal sphincter or irritate the tissue. During a healing phase, easing off them helps the tissue settle. Foods come back gradually.

Molly works with clients through a temporary healing phase. Common triggers include chocolate, coffee, alcohol, carbonated drinks, citrus, tomato, and fried foods. Each person has a threshold, and the amount matters as much as the food.

She is careful here. Strict, perfectionist eating can create its own anxiety around food. TThe aim is to calm the tissue, then add foods back gradually as the body settles.

How do I know if reflux is affecting my sleep?

Nocturnal reflux can disrupt sleep without obvious heartburn. Signs include waking with a burning chest or throat, a sore throat, coughing, or excess mucus.

Eating trigger foods late, then lying down, gives reflux a clear path. Many people develop inflammation overnight and never connect it to their sleep. They wake up unrested and do not know why.

Silent reflux can show up without heartburn at all. Watch for a morning sore throat, throat clearing, coughing, or a feeling of choking. These can be signs worth exploring with your provider.

Why is acid reflux a Biology of Trauma^® issue?

Reflux can be the gut's expression of a dysregulated nervous system. It often reflects a freeze state, old survival patterns, and grief the body still holds.

This is the lens Dr. Aimie brings to every symptom. The five patterns of stored trauma live in the body. Reflux is one place Dysregulation and Disruption become visible.

Underneath, there is often a freeze state and unresolved grief. The people-pleasing and self-neglect are old survival patterns. Calming the gut starts with helping the nervous system feel safe.

FAQ

Why do I get acid reflux when I'm stressed or anxious?

Stress shifts your body into a survival state. Blood moves away from the gut, digestion slows, and the esophageal sphincter loosens. Acid can then move upward. The reflux is real, and so is the stress driving it.

Can the vagus nerve cause acid reflux?

The vagus nerve controls much of digestion, including the lower esophageal sphincter. When vagal tone is low and the nervous system is dysregulated, that sphincter may not close properly. Reflux can follow. Supporting the vagus nerve supports digestion.

Why can't I tell when I'm hungry until I'm starving?

This often comes from muted interoception. When the body learns it is not safe, it can quiet internal signals like hunger and fullness. The cue may arrive late, or as fatigue or irritability. It can be rebuilt with practice and nervous system support.

How do I calm reflux naturally?

Start small. Slow diaphragmatic breathing after meals, a gentle walk, and slowing down to chew well all help. Easing off trigger foods during a healing phase can calm the tissue. The deeper work is helping your nervous system feel safe.

Why do I wake up with a sore throat or coughing?

This can be silent or nocturnal reflux. Eating trigger foods late and lying down lets acid reach the throat overnight. Signs include a morning sore throat, coughing, throat clearing, or mucus. It is worth exploring with your provider.

Helpful Research:

1. Breit S, Kupferberg A, Rogler G, Hasler G. Vagus Nerve as Modulator of the Brain-Gut Axis in Psychiatric and Inflammatory Disorders. Frontiers in Psychiatry. 2018 Mar 13;9:44.

2. Wickramasinghe N, Thuraisingham A, Jayalath A, Wickramasinghe D, Samarasekara N, Yazaki E, Devanarayana NM. The association between symptoms of gastroesophageal reflux disease and perceived stress: A countrywide study of Sri Lanka. PLoS One. 2023 Nov 9;18(11):e0294135.

3. Eherer AJ, Netolitzky F, Högenauer C, Puschnig G, Hinterleitner TA, Scheidl S, Kraxner W, Krejs GJ, Hoffmann KM. Positive effect of abdominal breathing exercise on gastroesophageal reflux disease: a randomized, controlled study. The American Journal of Gastroenterology. 2012;107(3):372-378.

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