Prefer to listen? This piece pairs with Episode 9: Your Thyroid May Need Attention — my conversation with thyroid patient advocate Mary Shomon on the same TSH blind spots and symptom dismissal we’re digging into here.
Dr. Jeffrey Bland, known as the father of functional medicine, was asked one time, “why is there so much thyroid dysfunction?” He answered, “The thyroid is the sentinel gland for the environment.” I think of it as the canary in our environmental coal mines. It is a gland that often is involved in sensing the Environment. And, the thyroid sits at a crossroads of nearly every hormonal and environmental system in the body, so when something’s off in the broader environment, it often shows up there first.
The undiagnosed epidemic
According to the American Thyroid Association
- An estimated 20 million Americans have some form of thyroid disease.
- Up to 60 percent of those with thyroid disease are unaware of their condition.
- Women are five to eight times more likely than men to have thyroid problems.
- One woman in eight will develop a thyroid disorder during her lifetime.
- Large studies show roughly 4–7% of the general population has undiagnosed hypothyroidism, and the rate is higher in women, older adults, and certain ethnic groups.
- Postpartum thyroiditis affects 10% of women and is routinely mistaken for normal postpartum exhaustion or the “baby blues” — a gut-punch example of the diagnosis gap.
Why our “canary gland” aka the thyroid is so exposure-sensitive
The thyroid’s hormone-production pathway depends on iodine uptake via a specific transporter, and a wide range of common chemicals can jam that exact mechanism:
- Perchlorate, nitrate, and thiocyanate — found in food, water, and cigarette smoke — competitively block the same transporter the thyroid uses to take up iodine.
- PFAS (“forever chemicals”) can bind to thyroid hormone receptors and interfere with iodine uptake, disrupting TSH regulation.
- Because PFAS, PCBs, dioxins, and some heavy metals persist in the body for years, exposure keeps affecting thyroid function long after contact with the source ends.
- Sources run the gamut most people don’t think about: drinking water, air pollution, pesticides, flame retardants, cleaning supplies, personal care products, and food packaging.
- Fluoride, a halogen like iodine, competes with iodine for uptake by that same transporter — one more everyday exposure most people never think to question. Dr. Kumar’s episode goes deeper on the fluoride-thyroid connection.
Why perimenopause and menopause are the highest-risk window
You don’t get to choose your exposure, and you definitely don’t get a say in when your hormones decide to shift on you, either.
- Estrogen and thyroid hormone are hormonally linked — estrogen boosts the protein that carries thyroid hormone through the blood, so when estrogen drops during perimenopause, that whole system gets disrupted right when everything else is shifting too.
- The immune system gets more likely to attack the thyroid the longer a woman lives — thyroid antibody prevalence climbs from about 7% in teenage girls to 30% in women over 80.
- Some research shows hypothyroidism risk jumping 60% or more during the menopausal transition compared to premenopausal years.
- And here’s the trap: fatigue, brain fog, mood swings, weight gain, sleep disruption, hair loss — nearly identical symptom list to perimenopause itself, so thyroid dysfunction gets waved off as “just menopause” instead of tested for.
- The two conditions don’t just share symptoms, they compound each other’s real risk — untreated subclinical hypothyroidism during menopause worsens the cardiovascular risk that’s already climbing from low estrogen.
What a TSH test can’t tell you
The TSH test is the standard — and substandard — test ordered when a woman comes in complaining about weight gain or loss, hair loss, a thermostat that’s running too high or too low, crappy sleep, dry skin, and whatever other symptom routinely arrives around perimenopause. And there’s the rub. In order to know if it’s thyroid or fluctuating hormone levels, it makes sense to test for all of the thyroid hormones, not just TSH.
TSH isn’t even a thyroid hormone — it’s produced in the pituitary gland and tells the thyroid to either produce more, less, or stand down in its production of — tada — T4. But we can’t stop there, because if T4 isn’t free to convert into T3, your cells won’t be getting enough of what they need to regulate your thermostat and, by extension, your metabolism. Let me point you to a comprehensive but easy-to-follow article from Rupa Health to follow this trail of hormones and conversion.
T3 is the one that actually does the work — it’s the form that gets into your cells and tells them what to do, driving everything from your blood vessels to your bones. When you don’t have enough of it, that’s when fatigue, hair loss, constipation, and stubborn weight show up.
Hypothyroidism (underactive) symptoms:
- Persistent fatigue, even after a full night’s sleep
- Unexplained weight gain or trouble losing weight
- Cold intolerance
- Dry skin, brittle nails, hair thinning or loss
- Constipation
- Depression, brain fog, sluggish thinking
- Heavy or irregular periods
Swing the other way and it’s an entirely different problem. Too much and you’ll run hot, also lose hair, enjoy heart palpitations and weight loss–not necessarily the good kind.
Hyperthyroidism (overactive) symptoms:
- Unexplained weight loss despite normal or increased appetite
- Rapid or irregular heartbeat, palpitations
- Anxiety, irritability, feeling “wired”
- Heat intolerance, excessive sweating
- Hand tremors
- Trouble sleeping
- Lighter or irregular periods
Beyond the symptoms — what’s actually at stake
Untreated hypothyroidism:
- Heart disease — raises LDL cholesterol and increases risk of irregular heart rhythm and heart failure
- Nerve damage — long-term untreated hypothyroidism can cause pain, numbness, and tingling in the arms and legs
- Pregnancy risk — raises the risk of miscarriage, premature delivery, and preeclampsia
- Myxedema — a rare but life-threatening complication involving severe swelling, extreme cold intolerance, and progression to lethargy and unconsciousness
Untreated hyperthyroidism:
- Heart — increased risk of atrial fibrillation, heart failure, and cardiomyopathy from the heart working in overdrive
- Bone loss — significant bone density loss leading to osteoporosis and higher fracture risk, especially past age 60 or with estrogen deficiency
- Thyroid storm — a rare, life-threatening complication with a mortality rate estimated between 8 and 25%, often triggered by illness or stress in someone with existing, often undiagnosed, hyperthyroidism
Can’t we start with TSH? Sure — but if you fall into the “normal” range for people your age, raging symptoms intact, you’ll likely be told your symptoms are just part of getting older. 😡
And normal ranges are too broad to capture everyone who needs thyroid support. Most women who test at the high end of TSH production (4.0) will be underwater in symptoms — and immediately feel better with thyroid meds or glandulars bringing them into a range of 2.0 to 2.5.
Sadly, even most endocrinologists don’t know the drill — and it’s not entirely their fault. Endocrinology as a specialty is trained to catch disease, not to optimize how you feel. The standard TSH range spans a tenfold difference; the range functional practitioners actually work toward is far narrower.
Free T3, the active hormone, almost never gets ordered without someone specifically pushing for it. So a normal TSH can sit right on top of a conversion problem, or early autoimmune thyroiditis, and a system built to catch disease simply isn’t built to catch that.
One more item for the testing list: antibodies. Thyroid antibodies develop when a person’s immune system mistakenly attacks the thyroid cells and tissues. This leads to inflammation, tissue damage or disrupted thyroid function. These antibodies cause autoimmune thyroid disorders, such as Graves’ disease and Hashimoto’s thyroiditis.
What Can You Do?
There is no shortage of suggestions for supplements, hormones, foods, and exercises to support and perhaps heal the thyroid. I’m not going there but I will suggest the following without worrying about what specifically you and your genetics need.
- If you are suffering with the symptoms mentioned here, find a doctor who will order a complete thyroid panel or order one online. Once you have your results you’ll want a doc, probably an alternative or functional medicine type, who is versed in the delicate balance of thyroid health. If you are in perimenopause or menopause it would be best if this doc is also practicing hormone replacement. You’ve seen how these two systems work together.
- Read the labels on all of your cleaning products, skin and hair care products, even clothing. You’re looking for chemicals that are hormone disrupters or otherwise known as poison. Not sure what to look for? Head over to EWG, the environmental working group’s site for their consumer guides to clean living. Remember, what goes on, goes in.
- Eat clean, lots of color, plenty of protein and healthy fats (no seed oils or trans fats).
- Exercise in moderation. High intensity exercises cause stress–not usually bad–but too much stress can inhibit thyroid function. Besides, if you are already exhausted, pushing yourself to do HIIT or run hard will backfire on supporting your system.
And if you’re already being treated, here’s where it gets interesting.
Quick review of medications
Levothyroxine (Synthroid) is the most commonly prescribed thyroid medication for those with hypothyroidism. It is a synthetic but bioidentical version of T4. Again, T4 is the inactive form of thyroid hormone, it must be converted to the active form, T3. Many women get a little better but not enough to feel good. Some docs will add Liothyronine (Cytomel), T3–smart doc–to add that much needed active form.
My personal preference: Nature-Throid, a natural desiccated thyroid (NDT) extract derived from pig thyroid glands, providing a combination of T4 and T3 hormones.
Funny thing about our silly FDA. This and other glandulars were the only solutions available for people for many years. They predate the formation of the FDA. As such there are no double blind placebo controlled studies and such. The FDA is trying to take them off the market because of this. Yet for over 100 years they have safely–with the guidance of an expert–been helping people get healthy and feel good.
7. Close: “old girl wisdom” tag
The thyroid isn’t broken. It’s the messenger — and it’s been shouting since page one. Normal labs, real symptoms? That’s not aging. That’s data. Get the full panel, trust what your body’s telling you, and stop letting “normal” talk you out of what you already know.
Old girl wisdom.
