Women are five to eight times more likely than men to develop low thyroid. Let that sink in. Then, add in that thyroid issues affect close to 15% of women at some point. And autoimmune thyroid disease, like Hashimoto's, is three times more common in women, and the risk climbs as estrogen shifts during perimenopause and menopause. Those numbers come from Dr. Bruce Dorr, M.D., Senior Medical Advisor at Biote, and as someone who developed hypothyroidism in my 40s, these stats also feel all too personal. This week we’re covering how thyroid symptoms overlap with peri/menopause and how to know the difference.
🧠 The takeaway
Thyroid disease affects roughly 1 in 7 women at some point, and is up to 8 times more common in women than men.
A full thyroid panel goes well beyond TSH, and the extras often catch what standard screening misses.
Menopause and thyroid symptoms overlap heavily, but a few clues point more toward the thyroid.
🤔 What else might be missing from your annual visit? Check out the 3 lab numbers doctors say matter most.
How the thyroid works, and what a full panel should include
Think of the pituitary gland as a thermostat for your thyroid: when it senses thyroid hormone levels dropping, it releases more TSH (thyroid-stimulating hormone) to tell the thyroid to produce more. That's the loop most standard bloodwork checks.
But the thyroid mostly produces T4, which is an inactive form. It's your body's tissues, not the thyroid itself, that convert T4 into T3, the active hormone that actually drives your metabolism. “That conversion step can be disrupted by things like chronic stress, illness, poor nutrition, psychological strain, or simply getting older,” Dorr says. When that conversion isn't happening efficiently, a woman can have every classic symptom of an underactive thyroid (fatigue, brain fog, weight gain) even when her thyroid gland and her TSH look perfectly normal.
Because hypothyroidism is so common, a TSH and free T4 are part of a standard yearly screening test. But what doesn't get checked routinely is free T3, antibodies for Hashimoto's thyroiditis, or reverse T3, a molecule that can actually block T3 from doing its job.
To cover these gaps, Anna J'Nett Miller, APRN, FNP-C, founder of Desert Bloom Healthcare, says she often builds a fuller panel that includes:
TSH
Free T4 and Total T4
Free T3 and Total T3
Thyroid peroxidase (TPO) antibodies
Thyroglobulin antibodies
Reverse T3 (in select patients)
"Each marker provides different information about thyroid physiology," Miller says. TSH reflects pituitary signaling; free and total T4 show hormone production; free T3 shows what's actually available to tissues; antibody testing can flag Hashimoto's before major dysfunction sets in. And her broader approach is to track lab trends over time rather than judge a single number in isolation.
Why thyroid issues spike in midlife
"While declining estrogen doesn't directly cause thyroid disease, the hormonal fluctuations that occur during this transition influence immune function, thyroid hormone metabolism, and the way thyroid hormones interact with tissues throughout the body," Miller says.
This stage of life also often coincides with years of accumulated stress, poor sleep, inflammation, nutritional deficiencies, metabolic changes, and changes in body composition. In women who are already prone to autoimmune issues, Miller says these factors can be what tips Hashimoto's from a silent tendency into a diagnosable condition.
Early signs of thyroid dysfunction
The earliest signs of thyroid issues are often dismissed as 'just stress' and include things like fatigue, brain fog, constipation, hair loss, heavy periods, fertility struggles, and even symptoms that look remarkably like ADHD, says Dr. Jolene Brighten, a board-certified naturopathic endocrinologist and author of the forthcoming ADHD & Women.
Thyroid or menopause? How to tell
One of the greatest challenges is that the symptoms of thyroid dysfunction overlap significantly with perimenopause and menopause, making it easy for thyroid disease to be overlooked if providers assume every symptom is simply hormone-related, Miller says.
"Hot flashes, night sweats, irregular menstrual cycles, vaginal dryness, and changes in reproductive hormones are more suggestive of menopause. Constipation, cold intolerance, dry skin, slowed heart rate, hoarseness, and elevated cholesterol are more characteristic of hypothyroidism."
Miller’s advice: don't try to self-diagnose from symptoms alone. "Many women are actually experiencing both menopause and thyroid dysfunction simultaneously," she says, which is exactly why a full evaluation matters more than guessing.
How thyroid function impacts health and longevity
"The thyroid is really the master gland of the body, and it touches nearly every organ system we have," Dorr says. Left untreated, hypothyroidism doesn't stay contained. It can show up as fatigue and weight changes, hair thinning and brittle nails, brain fog, depression, joint aches, constipation, heart palpitations, and irregular periods. "Because low thyroid touches so many systems, it hides in plain sight," he says. "But left untreated, it leads to real disease, in the heart, the brain, the bones, the muscles, the gut."
Miller adds that untreated hypothyroidism may contribute to elevated LDL cholesterol, insulin resistance, weight gain, depression, memory changes, and increased cardiovascular risk over time. And excess thyroid hormone can increase the risk of atrial fibrillation and accelerate bone loss, particularly in postmenopausal women. "The goal isn't simply normalizing laboratory values," she says. "It's restoring healthy thyroid function while avoiding both under-treatment and over-treatment."
Lifestyle Support for Thyroid Health
“Medication replaces missing hormone, but it doesn't address inflammation, nutrient deficiencies, sleep, blood sugar regulation, stress, or other factors that determine how well you actually feel, so lifestyle still matters,” says Brighten.
“What's overhyped are restrictive ‘thyroid healing diets’. What the evidence consistently supports is individualized nutrition, adequate protein, resistance training, correcting nutrient deficiencies, and optimizing medication timing,” adds Brighten.
What this means for you and your thyroid
"Don't chalk your symptoms up to getting older and move on," Dorr says. "Ask for a TSH test. It's simple, it's cheap, and it can change your entire treatment plan. Even if you had normal thyroid labs a few years back, that doesn't mean you're still in the clear today."
Miller's advice is to bring the whole picture, not just one symptom: don't assume every change is "just menopause," but don't assume it's automatically the thyroid either. Ask what changed, and ask for a comprehensive evaluation rather than accepting that feeling off is simply part of getting older.
While reference ranges can help identify disease across a population, they don't always show what has changed for the individual woman.
“Women deserve to know that feeling exhausted, mentally foggy, or unlike themselves isn't something they should simply accept as a normal part of aging," says Miller.
If that describes how you’ve felt lately and you haven’t had your thyroid function checked, consider this your invitation to do so.
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