How do I know if it is PMDD rather than PMS?

Severity and impairment, and the timing. PMDD symptoms are marked enough to affect functioning, occur in the luteal phase and resolve within a few days of bleeding starting. Diagnosis requires daily prospective tracking over at least two cycles, which is why the week above starts there.

Why do my hormone tests come back normal?

Because the current understanding is differential sensitivity to normal hormonal fluctuation rather than abnormal hormone levels. Normal results do not contradict the diagnosis.

Do breathing exercises help?

They lower arousal and support sleep, which amplify everything else in that week. They do not address the underlying sensitivity, and for severe symptoms there are specific effective treatments worth asking about.

Anxiety in the week before your period: PMS, PMDD, and the difference

For about a week every month you are a different person — anxious, irritable, tearful, certain that everything in your life is wrong. Then your period starts and it lifts, and you feel foolish about what you said.

Do this now

A luteal-phase daily anchor

10 minutes

Do this every day in the second half of your cycle rather than only on the bad days.
Sit comfortably, mouth closed. In through the nose for five, out for five. No holds.
Ten minutes. Keep it quiet, small and unhurried.
Afterwards, write one line: mood out of five, irritability out of five, sleep out of five, and the cycle day.
Those numbers are the point. Cyclical patterns are invisible from inside a bad week and obvious on two months of paper.

Run it with a timer

Cyclical does not mean imagined

Premenstrual symptoms follow the luteal phase and resolve within a few days of menstruation starting — that timing is the defining feature. Premenstrual dysphoric disorder is the severe form, recognised in DSM-5 and ICD-11, affecting a small but significant percentage of menstruating people, with marked mood, anxiety and irritability symptoms that impair function. The current understanding involves differential sensitivity to normal fluctuations in progesterone metabolites rather than abnormal hormone levels, which is why hormone tests come back normal.

Why tracking is the first intervention

Diagnosis of PMDD requires prospective daily rating over at least two cycles — it cannot be made retrospectively, because memory reconstructs the pattern badly in both directions. Tracking also changes how the week feels: knowing on day 24 that this is day 24 is meaningfully different from concluding that your life has become unbearable.

What breathing does and what it does not

It lowers arousal and supports sleep, which are amplifiers of everything else in the luteal phase, and daily slow breathing is a reasonable low-cost anchor. It does not address the underlying sensitivity. For PMDD the treatments with evidence are SSRIs — including luteal-phase-only dosing, which is unusual and effective — combined hormonal contraception in some regimens, and CBT. Those are worth knowing about, because PMDD is frequently dismissed.

What changes it, over a week

Every day for two cycles
One line: mood, irritability, sleep, cycle day. This is the diagnostic step as well as the useful one.
Luteal phase, daily
Ten minutes of slow nasal breathing, whether or not it feels needed that day.
Protect the week
Fewer consequential decisions and difficult conversations in the luteal phase, where you have the choice. Scheduling around it is legitimate.
If it is severe
Take your two cycles of tracking to a clinician and ask about PMDD specifically, including luteal-phase SSRI dosing.

When this is not a breathing pattern

See a clinician — promptly, and before assuming any of this applies to you — if any of these describe you:

Thoughts of harming yourself, which are more common premenstrually and always need same-day help
Symptoms that do not resolve after your period starts — that pattern suggests an underlying mood or anxiety disorder rather than PMDD
Symptoms severe enough to affect work, study or relationships every month
Heavy bleeding, severe pain, or a change in cycle pattern — needs gynaecological assessment
Any thoughts of harming yourself — contact your doctor or a crisis line today

This page is education, not medical advice, and no part of it is a diagnosis. Full disclaimer.

Questions people ask

How do I know if it is PMDD rather than PMS?: Severity and impairment, and the timing. PMDD symptoms are marked enough to affect functioning, occur in the luteal phase and resolve within a few days of bleeding starting. Diagnosis requires daily prospective tracking over at least two cycles, which is why the week above starts there.
Why do my hormone tests come back normal?: Because the current understanding is differential sensitivity to normal hormonal fluctuation rather than abnormal hormone levels. Normal results do not contradict the diagnosis.
Do breathing exercises help?: They lower arousal and support sleep, which amplify everything else in that week. They do not address the underlying sensitivity, and for severe symptoms there are specific effective treatments worth asking about.

What this page is built on

— Epperson et al., 2012, American Journal of Psychiatry — premenstrual dysphoric disorder: evidence for a new category
— Marjoribanks et al., 2013, Cochrane Database — selective serotonin reuptake inhibitors for premenstrual syndrome
— Schmidt et al., 1998, New England Journal of Medicine — differential sensitivity to normal hormonal changes

Named by author and year. The DOIs live in the journal.

Put a number on it

Most of what is on this page tracks one measurement: the Control Pause. It takes sixty seconds, needs no account, and it is the thing that tells you whether any of this is working.