Her Thyroid | Why am I so tired?

Have you ever been told your thyroid labs are "normal," only to leave the appointment wondering why you still feel terrible?

Maybe you're exhausted all the time. The scale keeps creeping up even though nothing about your routine has changed. You're always cold when everyone else seems comfortable. Your hair isn't as thick as it used to be, you're constipated, and it's getting harder to think clearly.

None of that feels normal.

If that's where you are, I want you to hear this first: you're not lazy, you're not imagining it, and you're certainly not making it up. Your symptoms are real and your body is doing an amazing job communicating with you about them. The question isn't whether they're happening. The question is why.

Your thyroid has a hand in almost everything that affects how you feel every day. It helps regulate your metabolism, body temperature, energy, focus, mood, and even how quickly your digestive system moves. Even though it's just a small butterfly shaped gland at the base of your neck, it's part of a much bigger conversation happening throughout your body.

Here's how that conversation works.

Your brain starts by sending a message to your pituitary gland. The pituitary releases thyroid stimulating hormone (TSH), which tells your thyroid to produce mostly T4. From there, your liver, kidneys, and other tissues convert T4 into T3, the active thyroid hormone your cells actually use.

Think of T4 as the raw ingredients and T3 as the finished meal. Your thyroid can produce plenty of T4, but if your body isn't converting it well, your cells may still not be getting what they need.

That's why T3 is so important. It's the hormone that helps you feel warm, energized, mentally clear, and metabolically alive.

Unfortunately, this is also where many women fall through the cracks.

For many providers, thyroid testing begins and ends with TSH. While TSH is an important piece of the puzzle, it isn't the entire picture. Looking at one number doesn't always tell us what's happening farther down the pathway. Free T4, free T3, reverse T3, thyroid antibodies, and even iron stores can all provide valuable information, especially when your symptoms tell a different story than your lab report.

One marker that often surprises women is reverse T3.

I like to think of reverse T3 as your body's emergency brake. When you're dealing with chronic stress, inflammation, illness, or significant nutrient depletion, your body sometimes decides it's not the right time to burn through energy. Instead of converting T4 into active T3, it converts more of it into reverse T3, an inactive form.

So this isn't your body failing.

It's your body adapting.

The frustrating part is that this protective response can leave you feeling like you're walking through life with the parking brake on. You're tired, sluggish, cold, and wondering why your body seems to be working against you when, in reality, it's trying to protect you.

This is one of the reasons symptoms matter so much. Lab values matter too, but numbers should always be interpreted alongside how you're actually feeling. Your body doesn't experience health as a lab report. It experiences it every single day.

That's why I encourage every woman to ask for copies of her labs. They're your labs. You have every right to understand them.

Ask what your TSH was. Ask about your free T4 and free T3. Were thyroid antibodies checked? Was reverse T3 measured? What about ferritin, your iron storage marker? Understanding your numbers helps you recognize patterns over time instead of relying on a single snapshot.

This conversation becomes even more important when we talk about Hashimoto's thyroiditis, the most common autoimmune cause of hypothyroidism.

Many women develop thyroid antibodies years before their TSH becomes abnormal. Their thyroid may still be producing enough hormone to stay within the "normal" range, but their immune system has already begun attacking the gland.

That's an opportunity.

It's an opportunity to look at nutrition, gut health, stress, sleep, vitamin D, selenium, zinc, iron, and inflammation before more damage occurs. It's an opportunity to support the body earlier instead of waiting until thyroid function declines enough to trigger an abnormal lab result.

When it comes to treatment, there isn't one right answer for everyone.

Some women feel dramatically better once they're on levothyroxine or Synthroid. Others need additional T3 because their bodies struggle with conversion. Some benefit from addressing nutrient deficiencies, chronic stress, inflammation, or autoimmune triggers alongside medication. The best treatment plan is the one that's based on your body, not a one size fits all approach.

If your body feels like it's running on half power, don't let "your labs are normal" be the end of the conversation. Let it be the beginning of a better one.

Pay attention to your symptoms. Ask questions. Learn what your numbers actually mean. And if your concerns are brushed aside, keep looking until you find a provider who's willing to look at the whole picture with you.

Your body has been communicating with you all along. The more you understand what it's saying, the easier it becomes to make decisions that help you feel like yourself again.

- Dr. Liane

Ready to understand your thyroid beyond a single lab value?

If you've ever felt like your body is trying to tell you something but no one has explained what you're seeing, Her Hormones: Thyroid was created for you.

Inside the course, we'll walk through the entire thyroid conversation, from how your brain and thyroid communicate to what each lab actually means, why women are so often misdiagnosed, how Hashimoto's changes the picture, and what nutrition, supplements, and lifestyle factors can support healthy thyroid function.

Because when you understand the conversation that's already happening inside your body, you stop guessing and start making informed decisions with confidence.

- Lena

Explore Her Hormones: Thyroid and start making your body make sense.