Everyone else has taken their jumper off. Your hands are cold enough that you keep them around the mug.

Your voice is slightly hoarse first thing, in a way that clears by mid-morning.

Your gut has slowed down and you have quietly started buying things to fix it.

And the stairs feel like an incline now, in a body that has not changed what it does.

You have filed all of it under perimenopause, because that is the only word anyone has offered you since you turned 46.

It might be. It might also be the one thing in this entire picture that a blood test can settle definitively, and that nobody has looked at properly.

Scientists at the University of New Mexico just made a shocking discovery:

Inside the water you drink every single day, there are invisible toxic shards silently building up inside your brain…

Strangling your brain cells like a snake…

Crushing the connections that keep your memory sharp…

And speeding up memory loss by 50% every 8 years.

If you want to see what's erasing your memory daily — and stop it before it's too late — you need to check this out now:

The European Menopause and Andropause Society published a position statement on thyroid disease and menopause, led by Irene Lambrinoudaki, in Maturitas in 2024.

Subclinical hypothyroidism runs at around 6 to 10 percent of women in their reproductive years, and the statement notes it is often present or arises during the menopausal transition.

Then it sets out the overlap. Menstrual irregularity. Mood disturbance. Increased sweating. Disrupted sleep. Hair loss. Reduced libido. Anxiety and low mood. Night sweats. Diminished quality of life.

That is not a partial resemblance. It is the same presentation.

The statement's own conclusion is that differentiating the two is difficult.

A woman with an underactive thyroid gets told she is perimenopausal and is sent away.

A woman in perimenopause gets a thyroid result and is treated for that while the hormonal driver carries on untouched.

Both women lose years. And only one of these two conditions can be checked with a vial of blood and a number.

Here is the detail almost nobody is told.

The EMAS statement flags biotin interference with the immunoassays used to measure thyroid hormones. High-dose biotin can skew thyroid results, and not always in the same direction.

Biotin is the main ingredient in hair, skin and nail supplements. Which are marketed, relentlessly, to women in exactly this decade, often at doses far above anything dietary.

So a woman takes a supplement because her hair is thinning, and that supplement can distort the test that would explain why her hair is thinning.

Do this. If you take biotin, or any hair, skin and nail product, check the label and stop it before your blood test. Commonly at least two days, but ask your laboratory, because advice varies by assay.

And tell whoever takes the blood what you have been taking. Say the word biotin out loud.

Ask for TSH and free T4 together, and for thyroid peroxidase antibodies if your symptoms fit, rather than a single TSH in isolation.

Ask for the actual numbers and the laboratory's reference range, in writing. Not the word normal.

And if a result sits at the edge of the range while you feel like this, ask to repeat it in six to eight weeks rather than treating one reading as a verdict. Thyroid function moves.

Perimenopause is not something you get handed. It is what is left standing after somebody has actually looked.