Tired, cold, and told to wait

Mette is 49. She is tired whatever she does, and a night's sleep does not fix it. She is cold when nobody else is, in a cardigan while her colleagues work in shirtsleeves. There is more hair in her brush than there used to be, her weight keeps going up, and her muscles cramp more often than before.

In a meeting she used to chair, she loses the word she needs and stops. She turns down the presentation she would once have volunteered for. From the outside, it reads as someone who has lost her edge, and that reading follows her into the next appraisal.

At home, it is put down to a busy year. Everyone says so, and she says it too. Each change on its own is easy to explain away.

Mette is a composite, built from many women's stories, and the third of seven in this series from Scita meno, our free map of midlife symptoms.

My friend got further than Mette. I spoke to her this week. Her doctor ran a blood test and confirmed a thyroid problem. Then came watch and see: no monitoring, no follow-up date, and no clear sense of where she stands, what it affects or what to look out for. Do not medicate, the doctor said; it usually adjusts by itself.

My friend's story is real. She is happy for it to be shared, and I have left out her name.

I cannot judge that decision. I was not in the room, and I have not seen her numbers. What I can see is what she walked out with: nothing to watch, and nobody watching.

Watch and see is only a plan when both are in place. So what should be watched, by whom, and what can she do herself while she waits? Most of the answer has been in the research for years. Part of it arrived this Wednesday.

Why a busy year is the first answer

Mette is not being ignored. She is being explained one symptom at a time, and every explanation is reasonable on its own.

Tiredness comes up in about one in ten GP consultations, and everyday stress is one of its most common causes (Lægehåndbogen, Træthed). An underactive thyroid comes on slowly, so its signs are easy to get used to (1177, Hypotyreos) and easy to mistake for stress (Patienthåndbogen). Taken alone, not one of Mette's changes gives it away.

Taken together, they do. A Danish study found that the more of these symptoms a person has, the more likely a thyroid problem becomes; even a small suspicion should lead to a blood test (Carlé and colleagues, 2014). On Mette's map, all six of her changes link to the thyroid. What she needs first is someone who looks at all six together.

What the blood test can tell her, and what it cannot

Two names come back from the laboratory. TSH is the signal the brain sends to make the thyroid work; when the gland starts to struggle, TSH goes up. Free T4 is the hormone the thyroid actually produces. When TSH is raised but free T4 is still normal, doctors call it a mild or subclinical change.

Watch and see is the usual advice for that mild change. If that is what my friend has, the finding that matters most comes from three Danish population surveys: people with this mild change reported no more thyroid symptoms than people with a normal thyroid (Carlé and colleagues, 2021).

That does not make her tiredness less real. It means a mild thyroid change may not be the reason for it, or not the whole reason. This is how a label ends a search: the thyroid is found, the looking stops, and if the thyroid is not the whole story, she goes home with a name for it and the same tiredness.

Watch what, and how often?

Waiting is often the right call. Up to 60 per cent of mild changes settle on their own over the years (Lægehåndbogen, Hypothyreose). But waiting is only a plan when someone knows whom to watch, and how often.

Research knows whom. In Basel, 82 women with a mildly underactive thyroid were followed for about nine years. When TSH was only slightly raised, between 4 and 6, not one woman developed a full underactive thyroid within ten years. What changed the picture was thyroid antibodies, which show the immune system is working against the gland. When women had them, more than half developed a full underactive thyroid; without them, fewer than a quarter did (Huber and colleagues, 2002). The antibody test takes one blood sample, once, and it helps tell which women need closer watching.

Research also knows how often. The Danish GPs' guideline, updated in December 2025, puts the risk of a mild change becoming the full condition at 2 to 5 per cent a year. It asks for antibodies to be measured with the repeat test, and it sets a clear schedule when no treatment is started: a check every six months for the first two years, then once a year (DSAM, Høje TSH-værdier). That is what watch and see means on paper: a repeat test, an antibody result, and a date. My friend left with a result and a sentence.

Three things that pull on each other

Care tends to check one system at a time. In midlife, three common things pull on each other, and Mette's symptoms sit right where they overlap.

First, the thyroid needs iron to make its hormone; low iron slows an enzyme the gland depends on (Zimmermann and Köhrle, 2002). Second, an underactive thyroid often brings heavy periods, which drain iron (Lægehåndbogen, Hypothyreose). Up to one in five menstruating women has low iron, and the tiredness often starts before the blood count shows anaemia (Lægehåndbogen, Jernmangelanæmi; Lægehåndbogen, Ferritin). Third, all of this arrives in the same years as perimenopause. The European Menopause and Andropause Society warns that thyroid disease and perimenopause can co-exist, share symptoms, and delay the diagnosis (Mintziori and colleagues, 2024).

On Mette's map, the thyroid links to all six of her symptoms, and low iron links to four. They belong in the same consultation.

What changed this Wednesday

On Wednesday, four days before this issue, a team at Seoul National University Bundang Hospital, working with a thyroid-app company, published a study asking the question my friend was left with: could the watching happen between blood tests?

Thyroid hormone sets the pace of the heart. When the thyroid slows, the sleeping heart slows a little too, too little to notice on its own. The researchers studied 413 people, three quarters of them women. They paired each thyroid blood test with the sleeping heart rate recorded by a Fitbit over the 15 nights before it. Given one earlier blood result as the person's own baseline, an AI spotted the shift: it picked out about 8 in 10 cases where thyroid hormone had fallen, and 96 per cent of the severe ones. With two or three earlier blood results to learn from, it grew more accurate still (Shin and colleagues, 2026).

The authors state two clear limits. First, the underactive cases came from patients whose thyroid had been removed for cancer and whose hormone medicine was paused before a scan; that causes a sudden, deep drop, not the slow drift behind Mette's symptoms. Second, the system only looked for hormone that had actually fallen; the mild change, raised TSH with normal hormone, counted on the healthy side of its line, so it says nothing yet about a woman in my friend's position. It is a retrospective study, not a service, and the authors call for a prospective study in slow, natural thyroid changes before anyone relies on it. Even so, the direction matters: continuous watching, calibrated to her own earlier blood test, that tells her doctor when to look again.

That work builds on an older idea. In a study published in 2002, doctors in Aalborg took blood from 16 healthy men every month for a year. Each man's thyroid values stayed inside a personal band about half as wide as the range across the whole group, the kind of range laboratories use to define normal (Andersen and colleagues, 2002). It was a small study, and in men only. Its point: a result can sit inside the lab's range and still be a change for that person. Laboratory medicine now knows how to build personal ranges from earlier results, and European scientists are pushing for them (Plebani and Coskun, 2025), though in 2025 they noted this is still not used in routine care (Coskun and colleagues, 2025). Earlier results do not define her healthy normal on their own, but they do show whether something has moved.

In Denmark and Sweden, those earlier results already sit on sundhed.dk and in the journal on 1177. What is missing is the step that puts them side by side for her and her doctor, and the step that watches between the dates. One blood test, read against everyone else, is a snapshot. Her own numbers over time, read against herself, are what watch and see should become. It is the future we are building towards at Scita.

What a good appointment looks like

If Mette books an appointment, it starts with her GP in Denmark or her vårdcentral in Sweden. Nothing below asks a doctor to prescribe. It asks for a look, a plan, and the whole picture.

• Look when the picture fits. Swedish guidance tells doctors to test TSH generously when symptoms suggest it (1177 för vårdpersonal), and the Danish GPs' guideline asks for particular attention to middle-aged women (DSAM). TSH is usually the first test, read with free T4.
• Confirm before deciding. A slightly raised TSH is measured again with free T4 after one to three months (Lægehåndbogen, Hypothyreose), and antibodies are measured with it, once (DSAM, Høje TSH-værdier).
• If the answer is wait, give her the plan. The interval is in the guideline. She should leave the room with the date of the next test, and what should make her call sooner.
• Keep looking for the rest. Iron (read as ferritin with CRP), her periods, perimenopause, sleep, and mood belong in the same conversation, especially when the thyroid change is mild.
• Read her results against her own. Where earlier results exist, a change in them says more than a position inside the lab range.

What she can bring: She knows. She acts.

She does not need to diagnose herself, and the doctor decides what applies. What she can bring is her own record and her questions.

1. Her numbers. In Denmark, blood results are on sundhed.dk under Sundhedsdata and Laboratoriesvar. In Sweden, many results appear in her journal on 1177, though visibility varies by region (1177, Läs din journal). Writing down TSH, free T4, and the dates, including earlier ones, shows whether anything has moved.
2. One sheet of paper. Every change, and roughly when it began: tiredness, feeling cold, hair shedding, lost words, weight, and cramps. Include her periods (and whether they are heavier or longer), any family history of thyroid disease, and which medicines and supplements she takes.
3. Five questions.
   • "What were my results, and how do they compare with my earlier ones?"
   • "Have my thyroid antibodies been checked?"
   • "When do we test again, and what would change the plan?"
   • "Could something else add to my tiredness: iron, perimenopause, sleep?"
   • "What should make me call sooner?"
4. A date before she leaves, for the next test or the next talk.
5. Care with "support" supplements. In the US, 9 of 10 supplements sold for "thyroid support" contained thyroid hormone, some above common treatment doses (Kang and colleagues, 2013), and all 12 sold for energy and "adrenal support" contained it too (Akturk and colleagues, 2018). They can move the very levels her doctor is watching.

When not to wait

She should not start, stop, or change any medicine or supplement without her doctor. And some signs cannot wait for the next check. Black or bloody stools mean contacting a doctor at once: her own practice, or the out-of-hours service or emergency department when it is closed (1177, Blodbrist). Bleeding after menopause should always be examined by a doctor (Lægehåndbogen, Jernmangelanæmi). Very low thyroid hormone over a long time is rare, but life-threatening: a falling body temperature and pulse, with growing drowsiness or confusion, is an emergency. Call 112 (Lægehåndbogen, Hypothyreose; 1177, Hypotyreos).

Tell me your story

Mette needs someone to look at her six changes together. My friend needs a date and a plan. Neither should have to become a thyroid expert to get one.

We built Scita meno as an open, educational map, never a diagnosis. You can see how symptoms and explanations connect without sharing anything about your health. See Mette's map: her six symptoms and the fourteen explanations they connect to; her questions, answered from medical sources, follow soon. With a free account, you can also read her story from the outside: in the Family & friends reading for the people at home, and in the Work reading for a manager before an appraisal.

Have you, or someone close to you, been told it was a busy year, or to watch and see with no plan? Write to me at hello@scita.health. And if you are a researcher, doctor, or innovator whose work could help women like Mette, write to me too. What you tell us shapes the next editions. We never publish anyone's words without asking first, and you decide whether your name goes with them (how we look after what you send).

Next Sunday: Karin, 51, hungry and thirsty in new ways, and a shape that changed although she did not.