You know exactly when your toddler gave you a cold. He coughed right in your face and you thought, there it is. You know the moment.

Hashimoto’s does not work that way. There is no single moment you can point to and say, that’s when it started. That is not because you failed to find it. It’s because the root cause of Hashimoto’s isn’t one thing.

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Health with Hashimoto’s is your free weekly podcast that sorts this autoimmune condition into thyroid or immune. Each episode is for informational and educational purposes. Please discuss any questions or concerns with your trusted healthcare professional. Some links may be affiliate links, marked as such, at no extra cost to you.

Why root cause isn’t one moment you can point to

Hashimoto’s is not contagious. Nobody sneezed it onto you. There is no single exposure to trace back to.

So when I talk about root causes, I don’t mean one specific thing that started it. I mean everything that is either supporting your health or working against it.

Think about a plant. A tiny seedling doesn’t have one root holding it up. It has multiple small, stringy roots, all delivering nutrients at once. Your Hashimoto’s works the same way. It’s not one root. It’s several.

The three things every autoimmune condition has in common

Autoimmune conditions all have different names depending on what part of the body is being attacked. But they are all your immune system, and they all share three things in common.

Every autoimmune condition has a gut component. Every one has a genetic component. And every one has one or more triggers.

That’s what I mean when I say root causes, plural. Not one thing. Three categories, and inside each category, there can be several factors specific to you.

Why your gut is involved even if digestion feels fine

Your gut is responsible for 70 to 85 percent of your immune system. That’s not a small piece. That’s most of it.

This includes the foods you eat. Maybe gluten causes an inflammatory response in your body. Maybe it’s the lining of your gut (leaky gut is a real and common piece of this). Maybe it’s your microbiome, not enough of the right probiotics, or an overgrowth of the wrong ones, sometimes referred to as SIBO.

None of this requires you to already have obvious digestive symptoms. Your gut can be a root cause factor even if you feel fine after meals. If you want a full breakdown of where to start, How to Improve Gut Health with Hashimoto’s Without Overwhelm walks through it step by step.

How genetics loads the gun but doesn’t pull the trigger

A lot of autoimmune conditions have a genetic disposition behind them. That’s part of why one person in a family develops Hashimoto’s and another relative with the same genes never does.

I have Hashimoto’s. When I look back at my family, I can see other relatives who have it too. My dad does not have it, at least not that he knows of. He doesn’t go to the doctor much, and he doesn’t have the symptoms. But I know his parents and cousins, on that side of the family, have Hashimoto’s.

So my dad gave me a genetic predisposition toward it. When my immune system started to go haywire, that predisposition determined where it attacked. Somebody else with a different genetic pattern might develop a different autoimmune condition, or none at all, even with similar stress and gut factors.

Genetics is one piece. It’s not the whole picture, and it’s not something you caused or could have prevented. If genetic testing has ever shown an increased risk for you, episode 15 covers what to actually do with that information.

What counts as a trigger

The third piece is one or more triggers. This is where logic does most of the work, more than any lab test.

Environmental toxins are a common one. I grew up around Bath and Body Works candles and Glade plug-ins. My laundry detergent was scented. My fabric softener was scented. Nearly everything in my house had a fragrance to it.

You don’t need a lab to look back at your own history and notice a pattern like that. Stress is another common trigger. So is diet. So are past infections.

A trigger doesn’t have to be one dramatic event either. It can be years of low-grade exposure that finally adds up.

You don’t need expensive labs to start

As an RN, I still think some labs are worth having. But you do not need a stack of expensive functional medicine labs to start identifying your root causes. A lot of this comes down to logic. Look at your own history. Environmental toxins, stress patterns, past infections, family history. Most of that, you already know.

That said, some labs are worth having. I want to know if my thyroid is producing enough T4. I want to know if my body is converting that T4 to T3, so my cells can actually use it. And I want to know my reverse T3, which tells you if your body is putting the brakes on that conversion instead of using it for energy.

Think of it like gas and brakes. You want to know which one your body has its foot on.

I also want antibody levels tracked as a trend over time, not just a single number. Are they going up? Are they going down? That tells you whether what you’re doing (diet, stress management, environment) is working.

But none of that has to come first. You can start identifying your root causes with logic today, and layer labs in as it makes sense for your budget and your situation.

What to do with this

You don’t need a diagnosis-level mystery to solve here. You need a framework: gut, genetics, triggers. Once you can sort what you already know into those three categories, you stop guessing and start working with a plan.

Hashimoto’s Decoded: Thyroid or Immune walks you through exactly that framework, so you can understand what’s happening in your body and where to focus first. Get started with Hashimoto’s Decoded.