Your Thyroid Is More Than a TSH Number: What Women Need to Know About Thyroid Health

(This blog was written from my podcast fitNERD)

If you’ve ever walked into your doctor’s office feeling exhausted, gaining weight despite your best efforts, losing hair, freezing when everyone else is comfortable, struggling with brain fog, or noticing changes in your menstrual cycle, you may have wondered:

“Is something wrong with my thyroid?”

You get your bloodwork done, and then you hear one of two things:

“Your thyroid is fine.”

Or:

“Your TSH is high. Here’s some medication. We’ll check it again in six months.”

Sometimes that is exactly what needs to happen. Thyroid hormone replacement can be incredibly important and appropriate for people with hypothyroidism.

But the thyroid is not a single number on a lab report.

It is part of a much bigger system.

And understanding that system can help you become a more informed participant in your own healthcare.

Your Thyroid Does A LOT More Than Control Your Weight

Your thyroid is a small, butterfly-shaped gland located at the front of your neck, but its influence throughout your body is enormous.

Thyroid hormones affect things like:

• Energy production

• Metabolism

• Heart function

• Brain function

• Muscle function

• Body temperature

• Digestion

• And many other physiological processes

Your thyroid primarily produces T4, or thyroxine, along with some T3.

Much of the T3 circulating throughout your body comes from the conversion of T4 into T3 in tissues. T3 is the more biologically active thyroid hormone.

So already, we are dealing with more than one hormone.

But it gets even more interesting.

TSH Isn't Thyroid Hormone

One of the biggest things I want women to understand is that TSH is a signal—not thyroid hormone itself.

Think about your house thermostat.

The thermostat doesn't heat your house. It simply tells the furnace what to do.

TSH works somewhat like that.

Your hypothalamus communicates with your pituitary gland, and your pituitary communicates with your thyroid. The pituitary produces thyroid-stimulating hormone, or TSH, which signals the thyroid to produce thyroid hormones.

That means when your TSH is abnormal, the next question shouldn't always be:

“How do we fix the TSH?”

Sometimes the better question is:

“Why is the TSH abnormal?”

TSH can provide valuable information, but it doesn't tell the entire story by itself.

What About Free T4 and T3?

This is where thyroid testing can become a little more complicated.

Free T4 represents the portion of T4 that isn't bound to proteins and is available to your tissues.

Looking at TSH together with Free T4 can give your healthcare provider a much clearer picture of thyroid function.

For example, a pattern of high TSH with low Free T4 is commonly associated with primary hypothyroidism.

On the other hand, low TSH with high Free T4 can point toward hyperthyroidism.

And low TSH with low Free T4 can suggest a problem involving the pituitary rather than the thyroid itself.

See the difference?

Instead of simply asking, “Is my TSH normal?”, we're looking at patterns.

And that's an important distinction.

T3 can also be useful depending on the clinical situation. It is the more biologically active thyroid hormone, but that doesn't mean Free T3 is automatically the missing answer for everyone with thyroid symptoms. The appropriate testing depends on what your healthcare provider is trying to determine.

The Autoimmune Piece: Hashimoto's and Graves' Disease

This is where the thyroid conversation gets really interesting.

Your thyroid can be dysfunctional for different reasons.

One major category is autoimmune thyroid disease.

Hashimoto's

Hashimoto's is an autoimmune condition in which the immune system targets thyroid tissue.

Two antibodies you may hear about are:

• TPO antibodies — thyroid peroxidase antibodies

• Thyroglobulin antibodies (TgAb)

Over time, autoimmune activity can damage thyroid tissue and impair its ability to produce thyroid hormone.

And here's something important:

Autoimmune thyroid disease and thyroid hormone production aren't necessarily the same thing at the same moment in time.

Someone can have thyroid antibodies before developing obvious hypothyroidism.

That is why understanding the bigger picture matters.

Graves' Disease

Graves' disease is another autoimmune thyroid condition, but it generally pushes the thyroid in the opposite direction.

Antibodies such as TSI or TRAb can stimulate the thyroid and contribute to excessive thyroid hormone production.

Symptoms can include:

• Rapid heart rate

• Heat intolerance

• Sweating

• Tremors

• Anxiety

• Weight loss

• Difficulty sleeping

• And, in some cases, thyroid eye disease

Again, this isn't simply a story of a thyroid that's “too fast.”

It's an immune system conversation, too.

Why Are So Many Women Talking About Their Thyroid?

This is one of the questions I keep coming back to.

Why does it seem like everyone knows a woman with Hashimoto's?

There isn't one simple answer.

Genetics matter. Sex and reproductive hormones influence immune function. Pregnancy and postpartum changes can affect immune activity. Environmental and nutritional factors can influence thyroid physiology. Certain medications and other medical conditions can play a role as well.

There isn't one food that causes Hashimoto's.

There isn't one supplement that fixes it.

And there isn't one explanation for every woman.

Complicated doesn't mean hopeless. It means we have to look at the whole person.

Start With the Basics: Are You Actually Fueling Your Body?

This is one of the biggest things I see in women.

They want to lose weight, so they eat less.

Then they exercise harder.

Then they aren't seeing the results they want, so they cut more calories.

Meanwhile, they're stressed, sleeping poorly, training hard and wondering why they feel exhausted.

Your body requires energy to function.

Your endocrine system doesn't operate independently from your energy availability.

Eating as little as possible is not the same thing as being healthy.

And if you're exercising—especially lifting weights or doing a lot of cardio—you need adequate energy and adequate protein.

This becomes especially important if you're using an appetite-suppressing medication such as a GLP-1.

Don't let reduced appetite turn into chronically inadequate nutrition.

Protein Matters

Protein isn't a thyroid cure.

But your body needs protein for muscle, immune function, enzymes, tissue repair, recovery and countless other physiological processes.

If you're trying to lose weight while maintaining muscle, protein becomes even more important.

Instead of stressing about hitting some impossible protein number at breakfast, start simple:

Build your meals around quality protein.

Meat. Fish. Eggs. Or other protein sources that work for your individual needs.

Your thyroid strategy shouldn't be a giant pile of supplements sitting next to a diet that isn't providing enough food or protein.

Start with food.

Don't Automatically Blame Everything on Your Thyroid

Fatigue, hair loss, brain fog and poor exercise tolerance can happen for many reasons.

One of those things worth investigating is iron status.

Depending on the individual, your healthcare provider may evaluate things such as a CBC, ferritin and other iron markers.

Women who menstruate also lose iron through their menstrual cycles, which makes iron status particularly relevant.

But don't automatically assume:

“I'm tired, so I need iron.”

The goal is to understand what is actually happening.

And supplementation should be individualized.

Selenium, Iodine, Vitamin D and Omega-3s

These nutrients are all relevant to the bigger thyroid conversation—but this is where I think we need to be careful about supplement culture.

More is not always better.

Selenium

Selenium is involved in thyroid hormone metabolism and antioxidant systems.

Research has investigated selenium supplementation in people with Hashimoto's, including effects on TSH and TPO antibodies. Some studies have shown modest improvements, particularly in people who are selenium deficient or insufficient.

That doesn't mean everyone with Hashimoto's needs to take a high-dose selenium supplement.

Selenium also has an upper limit, and excessive intake can be harmful.

Food sources include seafood, meat and eggs. Brazil nuts can also contain significant amounts, although their selenium content can vary.

Iodine

Your thyroid needs iodine to make thyroid hormone.

But that doesn't mean taking massive amounts of iodine is automatically beneficial.

In susceptible people, excessive iodine can actually contribute to thyroid dysfunction.

The goal is adequacy—not megadosing.

Vitamin D

Vitamin D plays an important role in immune regulation.

If you're dealing with an autoimmune condition, knowing your vitamin D status can be useful. If you're deficient, correcting that deficiency is reasonable.

But vitamin D isn't a magic cure for autoimmune disease.

Omega-3s

Fatty fish such as salmon, sardines and mackerel provide omega-3 fatty acids.

Again, we're talking about building a nutrient-dense foundation—not searching for a magic supplement that fixes everything.

Let's Talk About the Gut

This is one of the areas I find most fascinating.

Your gastrointestinal tract and immune system are deeply connected.

So when someone is dealing with an autoimmune condition, I think it's worth asking questions about their gut health.

Are you dealing with:

• Constipation?

• Diarrhea?

• Bloating?

• Reflux?

• Food intolerances?

• A history of frequent antibiotics?

• Celiac disease?

• Inflammatory bowel disease?

• Poor diet quality?

• Inadequate fiber?

• Difficulty digesting food?

These questions don't prove that your gut caused your thyroid condition.

But they can help your healthcare provider understand the bigger picture.

What About Gluten?

This is one of those topics where I think nuance matters.

If you have celiac disease, avoiding gluten is not optional. A strict gluten-free diet is part of treatment.

Hashimoto's is also associated with celiac disease, so people with symptoms or risk factors may want to discuss appropriate testing with their healthcare provider.

But I don't believe we should tell every person with a thyroid condition:

“Gluten is destroying your thyroid.”

That's not what the evidence supports.

Instead, if you have Hashimoto's or suspect gluten is contributing to your symptoms, it's worth having an informed conversation with your healthcare provider about whether further evaluation or a dietary trial makes sense for you.

What About L-Glutamine and BPC-157?

This is where I want to be especially clear about the difference between interesting science and proven treatment.

L-glutamine is an amino acid used heavily by intestinal cells and has been studied in the context of intestinal barrier function.

BPC-157 is an experimental peptide that has generated interest because of preclinical research involving tissue repair, inflammation and gastrointestinal mechanisms.

That research is interesting.

But we do not currently have enough clinical evidence to say that BPC-157 treats Hashimoto's, prevents thyroid destruction or slows thyroid disease.

That's an important distinction.

I love emerging science. But emerging science should make us curious, not reckless.

The Most Underrated Thyroid “Supplement”?

Sleep.

I know. Not nearly as exciting as a new supplement or peptide.

But if you're sleeping five hours a night, eating in a massive calorie deficit, training hard and living under constant stress, buying another bottle of supplements probably isn't where I'd start.

Sleep is foundational to recovery and overall endocrine function.

And stress matters, too.

Chronic stress doesn't magically cause every thyroid disorder. But it can affect immune function, sleep, appetite, glucose regulation and overall physiology.

Sometimes the most important intervention isn't another supplement.

Sometimes it's:

More sleep.
More recovery.
More walking.
Less unnecessary intensity.
Better boundaries.
More time outside.
More time with the people you love.
More prayer.

Your nervous system matters.

Exercise Is Good—But Recovery Matters Too

If you have a thyroid condition, you don't need to be afraid of exercise.

Strength training is fantastic.

Walking is fantastic.

Cardio can be fantastic.

But exercise is still a stressor on the body—even when it's a good stressor.

If you're training intensely seven days a week, eating very little and sleeping five hours a night, your problem probably isn't that you need to exercise harder.

You may need to recover better.

I don't believe exhaustion should be a badge of honor.

Train hard when your body can handle it.

Then give your body what it needs to adapt.

And Yes, Sometimes Medication Is Absolutely Necessary

This is important because I don't want this conversation to turn into:

“Medication is bad.”

It isn't.

For some people, thyroid hormone replacement is absolutely necessary and can be life-changing.

Medication isn't failure.

And taking medication doesn't mean you've failed at nutrition, fitness or lifestyle.

The point is simply that medication and lifestyle aren't necessarily competing ideas.

Sometimes medication is the right tool.

Sometimes additional investigation is needed.

Sometimes both are appropriate.

The goal is to understand what is actually happening in your body and treat it appropriately.

What Labs Might Be Worth Discussing?

I'm not suggesting everyone order every thyroid test available.

The right test depends on your symptoms, history and clinical situation.

But if you're concerned about thyroid function, some of the pieces your healthcare provider may consider include:

Thyroid function

• TSH

• Free T4

• T3, when appropriate

Autoimmunity

• TPO antibodies

• Thyroglobulin antibodies

• TSI or TRAb when hyperthyroidism is suspected

Other factors that may be relevant depending on symptoms

• CBC

• Ferritin

• Iron studies

• Vitamin D

• B12

• Glucose and metabolic markers

• Liver and kidney function

And sometimes bloodwork isn't the entire story.

If there is a thyroid nodule, enlargement or another structural concern, imaging such as an ultrasound may be appropriate.

The goal isn't:

More labs. More labs. More labs.

The goal is:

The right labs for the right question.

Your Thyroid Doesn't Exist in Isolation

This is probably the biggest takeaway I want you to leave with.

Your thyroid is part of a network.

Your:

Brain
Pituitary
Thyroid
Liver
Gut
Immune system
Nutrients
Metabolism
Reproductive hormones
Sleep
Stress
Exercise
Genetics

all interact with one another.

So if your labs are abnormal, don't panic.

But don't ignore them either.

Don't immediately buy every thyroid supplement you see on the internet.

And don't be afraid to ask questions.

Ask:

What exactly is abnormal?

What pattern are my labs showing?

Could this be autoimmune?

Are there other factors contributing to my symptoms?

Am I eating enough?

Am I getting enough protein?

Could I have a nutrient deficiency?

How is my sleep?

How much stress am I carrying?

Am I exercising appropriately for my current ability to recover?

Is medication appropriate for my situation?

Those are much better questions than simply asking:

“How do I fix my thyroid?”

Because sometimes your thyroid isn't the only thing that needs attention.

Be Pro-Understanding Your Body

I'm not anti-doctor.

I'm not anti-medication.

I'm not telling you to stop taking your thyroid medication.

I'm not telling you that supplements or peptides can replace medical treatment.

I'm simply encouraging you to become pro-understanding your own body.

If you've been told your TSH is high, don't stop there.

Ask questions.

Connect the dots.

Look at the whole person.

And remember that complicated doesn't mean hopeless.

Your body is incredibly complex—and that complexity is exactly why learning how it works can be so empowering.

You are fearfully and wonderfully made.

Stay curious. Stay skeptical. Ask questions. And keep nerding out on your health.

This article is for educational purposes only and is not medical advice. Thyroid conditions require individualized evaluation and treatment by a qualified healthcare professional. Do not stop, start or change medication or supplements without discussing it with your healthcare provider.