When Panic Attacks Start in the Gut: A Clinical Thinking Case Study

What causes panic attacks when the brain isn’t the problem?

That’s the question I found myself asking after meeting a 28-year-old patient who was absolutely convinced her thyroid was behind everything. The panic attacks, the chronic anxiety, the feeling that her body was constantly “fighting something”—she’d traced it all back to her thyroid. She’d been on Armour since she was 13. She just knew that was the answer.

It wasn’t.

This case is a perfect example of why clinical thinking matters—and why the first answer is almost never the right one.

The Patient Who Had All the Answers

Before I even met this patient, I knew something was off. Her husband had been emailing me for weeks—questions about labs, about what to prepare, about what tests to order ahead of time. When someone asks that many questions before the first appointment, I pay attention. It’s often a sign of significant anxiety driving the bus.

When we finally connected, here’s what she told me: anxiety since elementary school, depression that lifted when she found running in middle school, a hypothyroid diagnosis at 13 (questionable), reflux and digestive issues that flared with stress, and her first full-blown panic attack in junior year of high school.

She described that first panic attack as an out-of-body experience. Numb. Disconnected. Like she wasn’t in her own skin.

Fast forward to now: she’d recently gotten married, been promoted to a high-stress executive assistant role, and gone to Costa Rica for her honeymoon—where she had another panic attack, followed by food poisoning from street food.

She came home with light-colored stools, fatty food intolerance, constant burping, and reflux worse than it had ever been. A few days later, her third major panic attack.

And she was certain—100% certain—that her thyroid was the problem.

What the Labs Actually Showed

Here’s where clinical thinking comes in. Her labs looked… pretty benign. Nothing screaming pathology. But when you understand physiology, the labs tell a different story.

Her fasting glucose was 71. That’s low. Not crisis-level, but low enough to matter. When I asked about the timing, she said she’d had it drawn at 2:30 PM after fasting all day.

Now, here’s the thing: healthy people can fast. They don’t crash. They have stored glycogen. Their blood sugar stays stable. When someone’s glucose drops to 71 after a normal fast, it tells me their metabolic resilience is shot.

Her A1C was 4.6—which looks fine on paper, but in a “wired and tired” patient, a lower A1C often means glucose is dropping too frequently. Her body was being propped up by stress hormones.

Bilirubin was slightly elevated. Not alarming, but significant when you combine it with light stools, fatty food intolerance, mid-back pain at the bra line, and constant burping. That’s bile insufficiency.

Her thyroid? Fine. TSH normal, Free T4 normal, Free T3 normal. A tiny antibody elevation at 40, but nothing that explained panic attacks.

And then she mentioned something that made everything click: every single panic attack had happened on a day she’d eaten chocolate.

Why Panic Attacks and Gut Health Are Connected

Here’s what I pieced together: this patient’s entire system was running on cortisol and adrenaline. Her metabolic buffer was gone. Her upper digestion was compromised—likely had been for years.

When digestion doesn’t work, you can’t break down fats properly. You can’t produce neurotransmitters. You can’t clear hormones. You can’t detoxify. The vagus nerve—which connects the gut to the brain—gets inflamed and dysfunctional.

And the body starts sending danger signals to the brain. Help. I’m not safe. Something’s wrong.

The brain responds by trying to protect her. More cortisol. More adrenaline. And adrenaline feels exactly like anxiety. Exactly like panic.

She actually told me once: “It felt like someone injected me with something.” Yes. That’s adrenaline.

The food poisoning in Costa Rica didn’t cause this. It exposed it. Her system was already fragile, and that trip was the straw that broke the camel’s back.

Why I Didn’t Start With Adaptogens

This is where I see so many practitioners go wrong. Patient has anxiety? Give them ashwagandha. Give them GABA. Give them adaptogens.

And it doesn’t work. Because you haven’t addressed why the body is anxious in the first place.

With this patient, I started with digestion. Bitters to prime the system. Zypan for digestive support. Bile salts to help with fat emulsification. Gallbladder support. And one calming formula—Gaia’s Calm Restore—to take the edge off while we fixed the root cause.

Four things. That’s it.

I also asked her to eat warm, cooked meals. No raw salads. No skipping meals. No intermittent fasting. The goal was to take pressure off her digestive system while we healed it.

A Practical Tip for Anxious Patients

One more thing I want to share from this case. This patient was an executive assistant—her brain ran on details and structure. After our appointment, I took my notes and used AI to organize them into a clean, clear visit recap.

Three priorities: optimize digestion, calm the nervous system, dietary recommendations. Plus a section on reassessing and adjusting.

She was so grateful. She said it helped her analytical brain understand where we were going—and when she got anxious between appointments, she could go back and remind herself: we have a plan.

It took me five minutes. It saved her hours of spiraling. Sometimes the simplest tools make the biggest difference.

The Takeaway: Don’t Stop at the Obvious Answer

When you have a patient with anxiety, ask yourself: what’s causing this? Where did it come from? The body doesn’t just wake up one day and decide to be anxious.

Look at upper digestion. Look at bile flow. Look at blood sugar stability. Look at the vagus nerve.

The first answer is almost never the right one. Keep digging until all the pieces fit together.

If you want to learn the framework I use to think through cases like this, download my free guide: The 6 Principles of Clinical Thinking. It’s the exact process I walk through with every complex patient.

Get it here: rondanelson.com/6principles