You are reading in bed. The house is quiet.

Then your heart does something. A single hard thud under your sternum.

A flutter. A pause that feels one beat too long before the next one lands.

It passes. Or it does not, and you lie there for twenty minutes with your fingers on your pulse.

You went to the doctor. The EKG came back normal. You were told your heart is fine.

Nobody mentioned that estrogen had been running part of your cardiac electrical system for three decades and has just walked off the job.

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Estrogen suppresses the branch of your nervous system responsible for fight-or-flight activation.

It also dampens how reactive your heart muscle is to catecholamines, the stress chemicals that make the heart beat harder and faster.

With estrogen steady, your heart absorbed small surges of adrenaline and you never knew it happened.

When estrogen swings in perimenopause, both of those brakes loosen at once. The same dose of adrenaline now reaches a heart that is more responsive to it.

Estrogen also influences the ion channels in cardiac cells that govern electrical timing.

Plastic seems harmless when it's just sitting on a shelf.

A container. A cup. A lid.

But add heat, and the story changes.

Studies have shown that warming food in plastic containers, or pouring hot drinks into disposable cups lined with plastic, can release far more tiny particles than the same plastic would at room temperature.

Most of us do at least one of these every single day without giving it a thought.

Over weeks, months and years, those particles add up.

And they don't just pass through. Scientists have detected them in human blood, in the lungs, and even in brain tissue.

Researchers are still working out what this means for memory and focus. There's no final verdict yet.

But you don't need one to start being a little more careful.

A few easy changes in how you heat, store and serve your food can noticeably cut how much plastic you take in.

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It is almost never a skipped beat. It is an extra one.

The heart fires early, before the chamber has finished filling, so that beat moves almost no blood and you feel nothing. Then the electrical system resets, and during that pause the chamber keeps filling.

The next beat empties a fuller chamber, harder than usual.

That thud is not your heart stopping. It is your heart catching up.

SWAN tracked palpitations in 3,276 women across the menopause transition and published the analysis in Menopause in January 2023.

Roughly half the women fell into groups with a high or moderate probability of palpitations through perimenopause and early postmenopause, and the pattern fell away as the transition settled.

This is not anxiety. It is documented, it is common, and it has a timeline.

When it happens, breathe in for four counts and out for six. The long exhale engages the vagus nerve, which is the parasympathetic brake you still have.

You are not calming yourself down. You are manually re-engaging a braking system estrogen used to run for you.

Then start a written log. Date, time, what you consumed in the previous six hours, and where you are in your cycle. Caffeine and alcohol both amplify catecholamine sensitivity, and so does a bad night. Patterns emerge, and many women find the episodes cluster at the same point each month.

And when you are told the EKG looks fine, ask for a Holter monitor or a patch. Ten seconds of recording is not forty-eight hours of recording, and the test that matters is the one running while the symptom is happening.

Some things do not wait for a monitor. Fainting or nearly fainting. Chest pain. Breathlessness at rest. A fast regular racing that switches on and off like a light. Sudden cardiac death in your family. Any of those, you go now.

Your heart is not failing. It is running without a filter nobody told you it had.

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