My Thyroid Labs are Normal, But I still Feel Terrible: What Does That Actually Mean?
You’re exhausted. Your brain feels foggy. You’re gaining weight or can’t seem to lose it no matter what you do. You’re cold when everyone else is comfortable. Your hair is thinning, your skin is dry, and you simply don’t feel like yourself anymore.
So you do what you’ve been taught to do.
You make an appointment with your doctor.
They run some labs, including a thyroid test, and a few days later your doctor tells you, “Everything is normal.”
And then you’re sent on your way.
Except you still feel terrible.
This is one of the reasons I believe we need to start thinking more critically about the way we approach chronic health issues. I believe many doctors are incredibly intelligent people who have been trained to follow a particular system and standard of care. The problem is that being highly trained within a system doesn’t mean that system is always asking the right questions.
Personally, I don’t put much faith in conventional medicine when it comes to finding and addressing the root causes of chronic illness. Acute care? Absolutely. If I’m in a car accident, having a heart attack, or need emergency surgery, I’m going to the hospital. Modern medicine is incredible at many things. But when someone has spent months or years feeling terrible and continues to be told that everything looks “normal,” I think we have to be willing to ask whether the current approach is giving us enough information.
I don’t believe we should blindly accept, “Your labs are normal,” as the end of the conversation without understanding what was actually tested in the first place.
So let’s talk about it.
What Does TSH Actually Tell You?
TSH is the thyroid test most people have heard of, and it’s often the first—and sometimes the only—test ordered when someone has their thyroid checked. TSH stands for thyroid stimulating hormone, and despite the name, it isn’t actually a hormone produced by the thyroid. It’s produced by the pituitary gland and acts as a messenger, telling the thyroid how much hormone the body needs.
Think of it this way: your pituitary sends a message to your thyroid saying, “Hey, we need more thyroid hormone over here.” That message is TSH. When the pituitary senses that there isn’t enough thyroid hormone circulating, it generally sends more TSH to stimulate the thyroid. When there’s enough thyroid hormone around, it backs off and sends less.
This is why a high TSH can point toward an underactive thyroid and a low TSH can point toward an overactive one. I know that sounds backwards at first, but remember—we’re measuring the message, not the thyroid hormone itself.
So why is TSH so often the first—and sometimes the only—thyroid test ordered?
And honestly, that’s where I have a problem with the current approach.
With how common thyroid disease is—and with the number of people who are unaware they have thyroid disease or who spend months or years trying to figure out why they feel so bad—I believe we need to reconsider the current guidelines for thyroid testing. In my opinion, every woman should have, at minimum, a TSH, Free T4, and Free T3 checked as part of her yearly exam. If she’s experiencing symptoms that could point toward thyroid dysfunction, I believe looking at all three becomes even more important.
Yes, I know that’s not what the current guidelines say. I also know that guidelines are written by people, based on the information and priorities they choose to consider. Guidelines are not immune from being outdated, incomplete, or simply not serving every individual well. We’ve seen recommendations change plenty of times in medicine. I don’t think we should treat today’s guidelines as though they are beyond question.
TSH is useful information. I look at it too. But I don’t believe it should be the gatekeeper that determines whether we get to look at the rest of the thyroid picture.
This is also why you’ll often see an order for TSH with reflex to T4. The lab checks TSH first, and if TSH falls outside a predetermined range, the lab automatically runs a T4 test. If TSH is within range, the additional testing often stops there.
Think about what that means. You can have symptoms that brought you to the doctor in the first place, have a “normal” TSH, and never have T4 checked. That particular order certainly won’t include Free T3.
Again, I don’t believe that’s enough information to simply close the book on the thyroid—especially when you’re sitting in front of your doctor telling them you don’t feel well.
Why TSH Isn’t the Entire Thyroid Picture
TSH is the message. But what happens after the message is sent?
Your thyroid responds by producing thyroid hormone, primarily T4, also called thyroxine. T4 isn’t nearly as biologically active as T3, so you can think of it as more of the body’s supply of thyroid hormone that can be converted into a form your tissues can use more actively.
That form is T3.
T3 is the more biologically active thyroid hormone and plays an important role in metabolism and many other processes throughout the body. A large amount of the conversion from T4 to T3 happens outside of the thyroid, including in the liver and other tissues. In other words, the process doesn’t end once the thyroid produces T4. There is more happening downstream.
Very simply, you can think of the process like this: TSH sends the message, the thyroid produces primarily T4, and T4 is converted into T3.
This is one reason I want to know what the actual thyroid hormones are doing. If we’re only looking at TSH, we’re looking at the signal from the pituitary. We’re not directly looking at the T4 being produced or the T3 that results from the conversion process.
When you look at thyroid lab testing, you’ll often see Free T4 and Free T3 rather than simply T4 and T3. That’s because most thyroid hormone circulating in your bloodstream is attached to proteins. The “free” portion isn’t attached to those proteins and is available to move into tissues and have biological effects. So, when I talk about Free T4 and Free T3, I’m talking about the portions of those hormones that are available for your body to use.
This is why I believe Free T4 and Free T3 deserve to be part of the conversation. If someone is experiencing symptoms, I want to know more than whether the pituitary’s message falls inside a laboratory reference range. I want to know what is happening with the hormones themselves.
And T4 doesn’t only become T3. It can also be converted into Reverse T3, which brings us to another thyroid marker I believe deserves far more attention than it currently receives. We’ll talk about that in a minute but first, let’s talk about antibodies.
What About Thyroid Antibodies?
Another part of the thyroid picture that I believe gets missed far too often is thyroid antibodies.
The two primary antibodies I look at are thyroid peroxidase antibodies, or TPO antibodies, and thyroglobulin antibodies, often abbreviated Tg antibodies. These antibodies can point toward an autoimmune process involving the thyroid, most commonly Hashimoto’s thyroiditis.
Here’s the easiest way I know to explain autoimmunity. Your immune system is supposed to protect you by identifying things that don’t belong—viruses, bacteria, and other threats—and responding to them. With autoimmune disease, the immune system gets confused and begins targeting part of your own body.
In Hashimoto’s, the immune system targets the thyroid. Over time, that autoimmune activity can contribute to inflammation and damage to thyroid tissue.
And this is where I think the TSH-only approach has a major blind spot.
A person can have thyroid antibodies present while their TSH is still sitting comfortably inside the laboratory reference range. That means an autoimmune process can be happening before someone meets the criteria for overt thyroid dysfunction based on TSH alone. If no one is checking thyroid antibodies, how would you know that process is there?
You wouldn’t.
And in my opinion, waiting until enough thyroid tissue has been affected for TSH to become abnormal is not the same thing as catching a problem early.
This is why I strongly believe thyroid antibodies should be part of a more comprehensive evaluation when someone is experiencing symptoms that could point toward thyroid dysfunction. I also believe that when antibodies are present, they should be checked periodically—particularly when someone is actively working to improve their autoimmune health and wants to monitor changes over time.
I don’t look at antibodies as a stand-alone answer to everything. No single lab tells the whole story. But I also don’t understand identifying an autoimmune process and then deciding that the only number worth watching from that point forward is TSH.
And Then There’s Reverse T3
Reverse T3, or rT3, is probably one of the thyroid markers I feel most strongly about—and also one of the markers conventional medicine tends to dismiss.
I often describe Reverse T3 as the brakes of the thyroid.
Your body doesn’t always want to keep the metabolic accelerator pressed to the floor. During times of significant stress or physiological strain, it can alter the way thyroid hormone is metabolized. One of those changes can involve converting more T4 into Reverse T3 rather than active T3.
I like to think of it as the body trying to slow things down and conserve resources.
Reverse T3 can rise in response to different types of physiological stress. That can include acute illness or injury, undereating, overexertion, significant stress, and other situations where the body is under strain. In my clinical work, I have also seen patterns where Reverse T3 appears to rise when someone is receiving more T4 medication than their body is handling well.
This is why I pay attention to it.
Does that mean every elevated Reverse T3 result means someone has thyroid dysfunction? No. Does one Reverse T3 result diagnose anything by itself? No. And that’s not how I use it.
I use it as another clue.
If I’m looking at someone who has symptoms, their TSH, Free T4, Free T3, medication use, and other lab patterns, Reverse T3 may give me additional information about what could be happening with thyroid hormone metabolism and the overall stress physiology of the body.
Conventional medicine generally doesn’t view Reverse T3 as a useful routine test for diagnosing hypothyroidism, and I disagree with the idea that means we should simply ignore it. Disagreement over how to use a test is not the same thing as proof that the information is worthless.
This is one of those areas where I think people need to be willing to do some critical thinking. Learn what the test measures. Learn why it isn’t considered useful by conventional medicine. Learn how practitioners who do use it interpret it. Then ask whether the argument that you’re being given actually makes sense.
What If All of Your Thyroid Labs Are “Normal”?
This brings us back to the original question: what if your TSH, Free T4, and Free T3 are all technically “normal,” but you still feel terrible?
I don’t think your symptoms should be ignored.
This is where understanding laboratory reference ranges becomes important. When a lab gives you a “normal” range, that range is generally created by looking at results from a large population and using statistical methods to determine where the majority of results fall. In other words, the reference range tells you what is statistically common within the population used to establish that range. And statistically speaking, a significant portion of our population has at least one chronic illness. That should tell you all you need to know.
But statistically common doesn’t automatically mean optimal for you.
That is why I also use optimal ranges as a reference when I’m looking at labs. An optimal range is not the same thing as a medical diagnosis, and there isn’t one universally agreed-upon optimal range for every lab marker. Instead, these ranges are often based on clinical experience, research, and looking for patterns associated with health or dysfunction.
I’m not looking for one magical number that every person needs to hit. Bodies don’t work that way. I’m looking at patterns.
Does the result make sense alongside the person’s symptoms? Their history? Their medications? Their diet and lifestyle? Their other lab results?
For example, I may also want to know what is happening with iron, cholesterol, blood sugar, liver markers, vitamin levels, and other areas of the body that can contribute to thyroid symptoms or affect the bigger picture.
And if you’re taking thyroid medication, context becomes even more important. The type of medication, the dose, when you took it in relation to your blood draw, and certain supplements can all affect how thyroid labs look. That’s another reason I don’t believe thyroid numbers should ever be interpreted as isolated data points.
The goal isn’t to stare at one number until we find one outside the reference range and declare victory. The goal is to look for patterns and ask whether the information we’re seeing actually makes sense for the person sitting in front of us.
Questions to Ask Your Doctor
You do not have to walk into your doctor’s office believing you know more than your doctor. You don’t need to diagnose yourself before you’re allowed to ask questions. And you don’t have to become confrontational to advocate for yourself.
But you do need to stop believing that asking questions is somehow disrespectful or that being a good patient means quietly accepting everything you’re told without understanding it.
It is your body. You have every right to understand what is being tested and why.
Here are a few questions worth asking:
- Which thyroid markers were tested?
- What were my actual results—not just whether they were “normal”?
- Were Free T4 and Free T3 tested? If not, why?
- Were thyroid antibodies tested? If not, why?
- How do my symptoms fit with my lab results?
- Could any of my medications or supplements affect these results?
- Are there other possible causes for the symptoms I’m experiencing?
- When should these labs be repeated?
And if you don’t understand the answer, ask again.
Seriously.
Say, “Can you explain that to me like I’m five?”
There is nothing wrong with needing information explained in a way you can actually understand. You should never leave an appointment feeling like you’re too stupid to understand your own health. The problem isn’t that you don’t understand medical jargon. The problem is when no one is willing to explain it to you.
My Own Thyroid Story
Everything I’ve talked about in this article is information I wish I had known before my own diagnosis. It took me almost 10 years to get there.
For years, I was left trying to understand why I didn’t feel right without knowing enough about my own labs to ask better questions. Looking back now, I wish I had understood what was actually being tested, what wasn’t being tested, and what those numbers were supposed to tell me.
Maybe things would have been caught sooner. I can’t go back and know that for sure. But I do know that spending years having to educate myself changed the way I look at healthcare.
That’s a big part of why I do what I do today.
I don’t want you to become your doctor. But I also don’t want you to hand over all responsibility for understanding your health to someone else simply because they have more letters after their name.
There is a middle ground.
Learn. Ask questions. Look at the information yourself. Get another opinion when something doesn’t make sense. And remember that a doctor being the expert in medicine doesn’t mean you aren’t the expert on what it feels like to live in your body.
What Should You Do If Your Labs Are “Normal” but You Still Feel Terrible?
First, don’t panic. But please don’t assume that nothing is wrong simply because one lab—or even one set of labs—was called “normal.”
Get your actual numbers. Find out what was tested. Learn what those tests actually measure. Look for the pieces that may be missing from the conversation. Look for patterns. Ask questions. And if you still don’t feel like you’re getting answers, keep advocating for yourself.
I know that’s easier said than done. We’ve been conditioned to believe that questioning our medical care means we’re being difficult, noncompliant, or disrespectful. I don’t believe that.
I believe you can respect a doctor’s education and expertise while still questioning whether the current approach is working for you.
Those things are not mutually exclusive.
And if you’re tired of trying to figure all of this out on your own, that’s where I can help. I can order and review laboratory testing, look for patterns and potential red flags, and help you understand what your numbers are telling you. I can also help you identify questions and concerns to take back to your healthcare provider.
I don’t diagnose or treat medical conditions. What I do is help you understand your health so you can stop blindly following a system you may not fully understand and start becoming an informed participant in your own care.
Because you don’t need to become your own doctor.
You need to become your own advocate.
