PMDD: When Your Cycle Affects Your Mood More Than It Should

For about a week each month, some women feel like a different person. More irritable, more hopeless, quicker to cry or snap, convinced that a relationship or a job is falling apart. Then their period starts, and within a few days the fog lifts so completely that the previous week is hard to explain, even to themselves.

That pattern has a name: premenstrual dysphoric disorder, or PMDD. It's a recognized depressive disorder in the DSM-5, the manual psychiatrists use for diagnosis. And it's one of the more satisfying conditions to treat, because we understand it better than most of psychiatry, and the treatments work well.

PMDD is not "bad PMS"

Most people who menstruate get some premenstrual symptoms: bloating, breast tenderness, cravings, a shorter fuse. PMDD is different in degree and in kind. The mood symptoms are the center of it, and they're severe enough to cause real distress or get in the way of work, relationships, or daily life.

The formal criteria ask for at least five symptoms in the week before your period, with at least one being a core mood symptom: marked mood swings or sudden sensitivity to rejection, irritability or anger, depressed mood or hopelessness, or anxiety and tension. The others can include trouble concentrating, fatigue, appetite changes, sleep changes, feeling overwhelmed, losing interest in things you usually care about, and physical symptoms like bloating or joint aches.

The timing is the whole diagnosis. Symptoms have to show up in the premenstrual week and become minimal or gone in the week after your period. If you feel this way all month, that's a different problem.

Estimates vary depending on how carefully it's measured, but the DSM-5 puts the 12-month prevalence at roughly 2 to 6 percent of women who menstruate. A larger group, possibly 13 to 18 percent, has premenstrual symptoms that cause meaningful problems without meeting full criteria. Many of them respond to the same treatments.

Why it happens

This is the part I most want people to understand, because it changes how they think about themselves.

Women with PMDD don't have abnormal hormone levels. Their estrogen and progesterone rise and fall the same way everyone else's do. What's different is how their brain responds to those changes.

Researchers at the National Institute of Mental Health showed this in the late 1990s. When they used medication to temporarily shut down the ovaries in women with PMDD, the symptoms went away. When they added estrogen or progesterone back, the symptoms came back. Women without PMDD went through the same hormone changes with no mood effect. Same hormones, different sensitivity.

In 2017 the same group found a possible reason at the cellular level: a set of genes (called the ESC/E(Z) complex) that helps cells adjust to hormone signals was working differently in cells from women with PMDD. That finding is still early, and it hasn't turned into a test or a treatment. But it's strong evidence that PMDD is biology, not a character flaw or a failure to cope.

A lot of the current research focuses on allopregnanolone, a substance the body makes from progesterone. It acts on GABA receptors, the same calming system that drugs like Valium work on. In most people it has a soothing effect. In women with PMDD, the rise and fall of allopregnanolone across the cycle seems to have the opposite effect, or at least not the calming one. This is a working theory, not settled science. It's a useful one, though, and it's driving new drug research.

How it's diagnosed

We usually ask women to track your symptoms every day for at least two cycles.

That isn't a bureaucratic hoop. When people recall their symptoms from memory, they tend to link them to their cycle more than daily tracking actually shows. Studies that rely on memory alone produce much higher prevalence estimates than studies that use daily ratings. A standard tool is the Daily Record of Severity of Problems (DRSP), a one-page daily checklist that's free online. A period-tracking app with a mood note works too, as long as you log every day, including the good days.

Tracking also catches the most common mix-up, which is premenstrual exacerbation. That's when someone has depression, anxiety, ADHD, or another ongoing condition all month, and it gets noticeably worse before their period. It's very common, and it's treated differently. Usually we treat the underlying condition first and then see what premenstrual symptoms remain.

I'll often start treatment before two full cycles of tracking if symptoms are severe. A provisional diagnosis is fine. But I still want the tracking, because it tells us whether treatment is working.

What treatment looks like

SSRIs are first-line, and they work differently here. SSRIs (sertraline, fluoxetine, escitalopram, paroxetine) are the best-studied treatment for PMDD, with dozens of placebo-controlled trials behind them. What surprises people is how fast they work. In depression, an SSRI takes weeks. In PMDD, many women feel better within days, sometimes faster. That speed suggests a separate mechanism, and one leading theory is that SSRIs help the brain convert progesterone into allopregnanolone more efficiently. We don't know for sure.

Because they act so quickly, SSRIs for PMDD don't always have to be taken every day. There are three common approaches:

• Every day, all month. The simplest option, and a recent Cochrane review found it may be somewhat more effective than the alternatives.

• Luteal phase only. You take the medication from around ovulation (roughly two weeks before your period) until your period starts. This works well for many women with regular cycles and means fewer days on medication.

• Increasing the dose before your period. For someone who already takes an SSRI for depression or anxiety, we can raise the dose for the premenstrual week.

The doses are often lower than what we use for depression. And stopping and starting monthly doesn't seem to cause the discontinuation symptoms people worry about.

Certain birth control pills can help. The idea is to quiet the hormone swings by suppressing ovulation. The best evidence is for pills containing drospirenone and ethinyl estradiol taken on a 24-day active, 4-day placebo schedule; one of these (Yaz) is FDA-approved for PMDD. I wouldn't oversell birth control in general, though. Standard 21/7 pills haven't clearly beaten placebo in trials, and some women feel worse on hormonal contraception, not better. If you've had a bad mood reaction to the pill before, tell your prescriber.

For severe cases that don't respond: medications that temporarily shut down the ovaries (GnRH agonists like leuprolide) can be very effective, essentially recreating the NIMH experiments as a treatment. They cause menopause-like side effects and usually need hormone "add-back" to protect bone health, so they're reserved for women who haven't responded to other options. Surgery to remove the ovaries is a last resort for the most severe cases.

On the horizon: drugs that target allopregnanolone directly are being studied. Results so far are mixed, and none are approved for PMDD. I find the research interesting, but it isn't something I'd plan around yet.

Exercise, sleep, and cutting back on alcohol help mood in general, and some women notice a real difference. They're worth doing. For moderate to severe PMDD, they usually aren't enough on their own, and I don't think anyone should feel they failed because lifestyle changes didn't fix it.

One thing to take seriously

PMDD can include thoughts of suicide during the premenstrual week, even in women who never have those thoughts the rest of the month. Because the thoughts come and go, people often dismiss them or never mention them. If this happens to you, tell your prescriber, even if you feel fine by the time of your appointment. If you're in immediate danger, call or text 988.

Where to start

If your worst week of the month keeps lining up with the week before your period, start tracking your mood every day now, through at least two cycles, and bring the log to your appointment. Two months of daily notes will tell your prescriber more than any one visit can, and with PMDD, it's often what gets you to the right treatment quickly.

Exploring treatment for PMDD or other hormone-related mood changes? Learn about women's mental health care at Viewpoint →

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Jamie Solomon, PMHNP-BC, has worked in psychiatry for more than 20 years and founded Viewpoint Integrative Psychiatry in Westwood, NJ, where she treats adults in New Jersey and New York. About Jamie →

This post is for educational purposes only and is not medical advice. Never start, stop, or change a medication without guidance from your prescribing clinician.