Thyroid dysfunction and perimenopause can cause many of the same midlife symptoms, including fatigue, brain fog, weight changes, mood changes, and sleep problems. For women’s health in Nashville, understanding this overlap can help you know when to discuss thyroid testing, perimenopause, or both with your physician.
By Leigh Anne Hulva, BSN, RN— Women’s Health Educator
[A note before we begin: What follows reflects my perspective as a nurse educator and women’s health advocate. This information is informed by the research literature on the menopause transition and the personal experiences of women navigating it. These are complex issues that present differently in every person. For that reason, this is in no way a clinical prescription. Please take what resonates with you, leave what doesn’t, and bring any specific concerns you have to your provider. This is simply one informed voice, offered with the hope that some part of it may be of help to you.]
Fatigue, brain fog, weight changes, mood swings… thyroid function and perimenopause share so many symptoms that it’s hard to know where one starts and the other begins, or rather, whether you have one or both. Overlapping symptoms can make them hard to distinguish, but this article breaks down how to tell them apart, why testing for both matters, and what to do if your provider treats one but dismisses the other. 
Meet Helen*
Helen, at 51, had a word for how she felt the year after her periods stopped: almost. She was almost herself. Almost well. Almost managing. The fatigue she had assumed would lift once the night sweats stopped waking her up all the time hadn’t. The brain fog that she had blamed on that disrupted sleep was still there even on the days after she’d slept reasonably well. She had gained weight— slowly, sure, but steadily— without having changed how much she ate or moved. It felt less like the expected metabolic slowdown of midlife and more like her body was running at a lower setting than it used to.
She had been offered hormone therapy at fifty, when the hot flashes were at their worst. It had helped, and she was thankful for that. The hot flashes receded; the night sweats dropped from often to rare; her sleep improved, and with it her mood. To a degree, at least. But here she was, almost a year later, and she still felt “not quite right” in ways she found hard to articulate. The fatigue in particular bothered her. And she was cold now, even when nobody else around her felt cold. Constipation was becoming a real frustration; one she now treated with over-the-counter remedies with increased frequency.
Helen mentioned all of this at a routine visit to her GP. She added that her mother had been diagnosed with an underactive thyroid in her 50s. Her GP paused at this. “Has anyone checked your thyroid since your menopausal symptoms began?” Helen said she didn’t think so. “Well, let’s do that,” her GP said.
The results came back showing subclinical hypothyroidism. This means that Helen’s thyroid-stimulating hormone (TSH) level was slightly elevated, while her free T4 level was normal. Helen’s GP referred her to an endocrinologist for further evaluation.
Helen sat in that waiting room, a month later, wondering about the year she had spent feeling almost well. She wondered how much of it had been hormone-related and how much had been something else entirely, sitting quietly underneath it all.
[*Case studies are fictional composites drawn from the real experiences of many women. Any resemblance to specific individuals is coincidental.]
Why Thyroid and Perimenopause Symptoms Overlap in Midlife Women
Perimenopause and thyroid dysfunction (particularly hypothyroidism, or underactive thyroid) are two of the most common conditions affecting women in their 40s and 50s. They’re also two conditions whose symptoms overlap so significantly that distinguishing between them (or recognizing when both are present) can be genuinely difficult.
The result is a pattern that many midlife women find terribly familiar: symptoms that are partially explained, partially treated, partially dismissed… and a lingering sense that something is still not quite right. Understanding this overlap — and why it occurs, and why both conditions deserve consideration in midlife women—is important.
I want to be clear about what this article is and what it is not. It is not a guide to diagnosing or treating thyroid conditions— that requires a qualified provider, appropriate testing, and clinical judgment that belongs in a medical encounter rather than a health article. This article invites you to recognize the overlap, educate yourself, ask better questions in the doctor’s office, and advocate for an evaluation that considers the full picture rather than stopping at the first explanation that fits.
The Shared Symptoms of Perimenopause and Hypothyroidism
The degree to which perimenopause and hypothyroidism share symptoms is striking enough that it deserves to be laid out directly. Both conditions can cause:
- Fatigue. This is the specific, persistent fatigue that sleep doesn’t fully resolve; it feels permanent rather than situational. This is one of the most common presenting complaints of women in midlife experiencing both conditions.
- Brain fog and cognitive difficulties. This includes difficulty concentrating, memory lapses, and mental sluggishness that can make even simple, familiar tasks feel overwhelming. Both estrogen decline and thyroid hormone deficiency can affect cognitive function through different—but overlapping—mechanisms.
- Weight changes. This generally includes unexplained weight gain, but also difficulty maintaining a previously stable weight despite no real changes in diet or activity. It appears very frequently in both hypothyroidism and perimenopause. The metabolic effects of both estrogen decline and thyroid hormone deficiency can change weight and body composition.
- Mood changes. Low mood, irritability, anxiety, and a general emotional flatness or volatility can reflect the hormonal fluctuations of perimenopause, the effects of thyroid dysfunction on mood-regulating neurotransmitters, or both simultaneously.
- Hair thinning. As discussed in our article on menopause and hair loss, declining estrogen and thyroid dysfunction can both affect the hair growth cycle and produce the diffuse thinning many women experience in midlife.
- Sleep disturbance. Difficulty falling asleep, staying asleep, or feeling rested after sleep appears in both conditions, through different mechanisms.
- Dry skin. Skin dryness and changes in skin texture are recognized features of both estrogen decline and hypothyroidism.
What this list should make clear is that a woman in midlife who presents with any combination of these symptoms could be experiencing perimenopause, hypothyroidism, or both. And treating one without considering the other risks leaving a significant contributor to her symptoms unaddressed.
The Symptoms That May Point More Specifically Toward Hypothyroidism
While the symptom overlap is significant, certain features are more likely to suggest thyroid dysfunction rather than perimenopause. This isn’t a rule for self-diagnosis, but rather just something to be aware of.
Cold intolerance, where you feel colder than others in the same environment, is more specifically associated with hypothyroidism. Chronic constipation that is difficult to explain through diet can also reflect the slowing effects of thyroid hormone deficiency on gut motility. A slowed heart rate, puffiness around the eyes, or a hoarse or changed voice are other features that should prompt a physician to consider thyroid function specifically.
Helen’s cold sensitivity and chronic constipation, in hindsight, were pointing toward something beyond the female hormones picture. Knowing what to mention, and that these seemingly benign symptoms deserve mention, is important.
Can Perimenopause and Thyroid Problems Occur at the Same Time?
When perimenopause and thyroid dysfunction co-occur— as they frequently can in midlife women— the clinical picture can be genuinely complex. Treating only one when both are present leaves a woman feeling, as Helen did, only just almost better. Don’t settle for feeling almost well. You’ve got decades of life ahead of you, and you deserve more than just almost enjoying it!
A woman who has been treated for perimenopause and isn’t responding as well as expected is a woman whose thyroid warrants attention. And a woman being evaluated for thyroid dysfunction is also a woman who should have her perimenopausal status considered as part of the big picture.
Why Thyroid Dysfunction Gets Missed in Midlife Women
Several factors contribute to thyroid dysfunction being missed in midlife women. The most straightforward of these is the fact that when a woman in her 40s or 50s comes into a doctor’s office with fatigue, brain fog, weight gain, and mood changes, it’s often reasonable to put the blame on perimenopause. And that might be correct, either partially or fully. But the problem arises when perimenopause is the only possibility considered, and no other investigation takes place.
Something else that can add a layer of complexity is subclinical hypothyroidism, where thyroid-stimulating hormone (TSH) levels fall above normal limits while free T4 levels remain normal. Symptoms can be mild, so a provider might miss a thyroid component if they don’t order a TSH test.
Questions Worth Asking Your Physician
- Has my thyroid function been checked since my perimenopausal symptoms began?
- Can we look at the full thyroid panel, including TSH, free T4, and thyroid antibodies?
- I’m being treated for perimenopause but still have significant fatigue— could thyroid function be contributing?
- My symptoms have improved with treatment, but not completely. What else might we be missing?
- If my results are in the normal range but just barely, is there cause to keep watching those levels with routine check-ups?
Advocating for a Complete Midlife Evaluation
Helen’s particular story turned on a detail she mentioned about family history. That detail prompted questions that led to a more comprehensive evaluation. If that testing hadn’t been done, the symptoms she’d been tolerating for a year might have gone on and on.
That’s why you need to advocate for yourself. If you feel your symptoms merit deeper investigation, that is a conversation you need to have with your provider. If your current provider is dismissive or not as thorough as you’d like, find another one. You deserve to feel your best.
Conclusion
Helen and her endocrinologist are working together to come up with the right approach to her subclinical hypothyroidism. She continues her hormone therapy, since it’s helped with the hot flashes and her sleep quality in real ways. She’s still almost well, but having the full picture gives her a sense of control that really helps, even on her tired days.
She does remember how mentioning to her GP that she had a family history of thyroid issues felt almost like an afterthought. It amazes her that that afterthought turned out to be an important part of the big picture.
Frequently Asked Questions (FAQs): Thyroid and Menopause
How do I know if my symptoms are from menopause or my thyroid?
The honest answer is that distinguishing between them can be genuinely difficult without testing, because the symptoms overlap so much. Fatigue, brain fog, weight changes, mood shifts, hair thinning, sleep disturbance, and dry skin all appear in both perimenopause and hypothyroidism.
The most reliable path to an answer is a thorough medical evaluation that considers both. This should include thyroid testing alongside an assessment of perimenopausal status, rather than assuming one explanation covers the full picture.
Should I get my thyroid checked during perimenopause?
If you are experiencing symptoms consistent with thyroid dysfunction—especially cold intolerance, unexplained weight gain, fatigue that doesn’t resolve with sleep, or significant cognitive symptoms—thyroid testing is a reasonable step to discuss with your provider. A family history of thyroid disease or dysfunction increases the relevance of testing, but even without specific risk factors, thyroid dysfunction becomes more common in women in their 40s and 50s and continues to rise as they age.
Can you have both perimenopause and thyroid problems at the same time?
Yes, and it’s more common than many women realize. Perimenopause peaks in prevalence in women in their 40s and 50s, and thyroid dysfunction grows more prevalent with age. Additionally, the hormonal changes of perimenopause may contribute to immune dysregulation that increases the risk of autoimmune thyroid disease (although this research is in its early stages). When both issues are present simultaneously, treating only one leaves symptoms only partially managed. This is the reason a woman who is being treated for perimenopause but isn’t responding as well as expected might benefit from explicit attention to her thyroid function.
Author Bio
I’m Leigh Anne Hulva, BSN, RN— a registered nurse, women’s health educator, mother of teenaged daughters, and passionate advocate for women navigating perimenopause and menopause. I recently completed the Harvard Medical School course on Women’s Health and in these pages I relish sharing what I learned there alongside what I know from lived experience. I bring to this work not only my training, but also the personal experience of navigating the very transition I write about. It is my privilege to share both, because this work is personal to me. I hope it feels that way to you, too. I relish sharing what I learned there alongside what I know from lived experience. I bring to this work not only my training, but also the personal experience of navigating the very transition I write about. It is my privilege to share both, because this work is personal to me. I hope it feels that way to you, too.
I have been on the other side of this conversation, and I understand how much it matters to feel truly heard. At Nashville Concierge Medicines, my work is supervised by Dr. William Conway, MD, and I work directly under his licensure as a nurse educator.
You can find me on LinkedIn at https://www.linkedin.com/in/leigh-anne-hulva-a37bb9290/
