For the person standing next to it

You are probably here because someone you love changes for a week or two a month, and you have run out of ideas.

This page isn’t about managing her. It’s about what is actually happening, and the small number of things that genuinely help.

What’s happening

PMDD is a cyclical mood disorder tied to the luteal phase — the roughly two weeks between ovulation and her period. Hormone levels are usually normal. The difference is how her brain responds to their ordinary rise and fall.

Two things follow from that, and they’re the two things most partners get wrong.

It isn’t about you, and it usually isn’t about the argument. The thing that set it off is real, but the size of the response is coming from somewhere else. Arguing the facts of the argument will not work, because the facts were never the load-bearing part.

She knows. Most people with PMDD watch themselves do it. The shame afterwards is frequently worse than the fortnight. Which means that afterwards, the most useful thing you can say is not "it’s fine" — it’s that you know it wasn’t her.

What actually helps

Learn where the window is, and don’t make her announce it. Once you know roughly which week it lands in, you can move the difficult conversation, take the school run, or cancel the dinner without her having to ask. Having to ask, every month, is its own grinding cost.

Do the logistics, not the feelings. "I’ve done dinner and I’ll handle bedtime" is worth more than any amount of asking how she’s doing. Reduce the number of decisions in front of her. Late luteal comes with real brain fog; every choice you remove is a genuine gift.

Don’t argue in the window. Write it down and come back to it in the follicular phase, when you will both be talking to the person you each married. Almost nothing needs resolving inside the fortnight.

Believe her about the timing. You will be tempted, in a good week, to conclude it wasn’t that bad. She will be tempted too. That shared forgetting is exactly why this goes undiagnosed for years.

Help her keep the record, and help her book the appointment. Two cycles of daily ratings is what a diagnosis requires, and the follicular phase — when she feels fine and stops believing herself — is when the appointment doesn’t get booked. That’s a specific, concrete job you can own.

What doesn’t help

• "Is it your hormones?" — even when it is. Especially when it is.
• Keeping score of what was said. She is already keeping score of what was said.
• Treating the good weeks as proof the bad weeks were exaggerated.
• Fixing. Most of the time there is nothing to fix, only a fortnight to get through.

Look after yourself too

Living alongside PMDD is genuinely hard, and pretending otherwise helps nobody. IAPMD runs moderated peer support groups specifically for partners and family — people who know exactly what this is like, which most of your friends won’t.

If she is talking about ending her life, take it seriously every single time, including the times it has happened before and passed. Don’t leave her alone with it, and don’t wait for a better moment. The numbers are here, and you can call them yourself, for advice about someone else.

One more thing

The single most useful sentence available to you, said in a good week rather than a bad one:

Say it before the window, not during it. She will remember it when she can’t remember much else.