Across the long rhythm of the menstrual cycle, a quiet truth is emerging about premenstrual dysphoric disorder: it does not arrive in one shape for everyone. Through two months of daily diaries kept by 90 women with the condition and a comparison group of 40 without it, researchers at Uppsala University, led by Erika Comasco, have begun to sort the suffering into three distinct patterns, each with its own timing and intensity. The reasons behind these patterns remain unknown, and the work of uncovering them, in the body and the brain, is only beginning. Still, the finding offers the hope that
Premenstrual Dysphoric Disorder Splits Into Three Subtypes, Symptom Diaries Suggest
PMDD does not look the same for everyone.
Mark
Why does it matter that there are three subtypes rather than one PMDD?
Mimi
Because two people with the same diagnosis can have very different months. One starts feeling bad about two weeks before her period; another only about 10 days before. Monitoring and treatment built around one pattern would miss that.
Mark
What are the three, exactly?
Mimi
Severe with early onset, peaking about five days before menstruation. Severe with late onset, peaking around the start of the period. And moderate with late onset, peaking about four days before and milder overall.
Luke
Before we get carried away, the sample is 90 women with PMDD and 40 controls, tracked for two months. That's modest, and it's self-reported diaries.
Mimi
True, and the researchers say as much about what remains unknown. The study can't say why the subtypes occur.
Mark
What about the link between symptoms?
Mimi
Anxiety rising was followed by more irritability, depressive symptoms and mood swings. It suggests symptoms feed each other over time.
Luke
But the source says more research is needed before that can predict anything for an individual. It's a population pattern, not a forecast for one woman.
Mark
And the SSRI work?
Mimi
A separate brain imaging study, with some of the same participants, found escitalopram reduced irritability and anger and made the anterior insula less reactive to provocation.
Luke
That's suggestive, not proof of mechanism. The researchers say the change "may be part of the explanation." Nothing here yet tells us which subtype responds to which treatment.
Il Polso
- Ninety women logged their moods daily for two months, and the pattern they revealed refused to fit a single mold.
- Three subtypes now stand apart, separated by when symptoms rise and how hard they hit, which unsettles the assumption that one diagnosis means one experience.
- Anxiety appears to set off a chain of irritability, depression and mood swings, a cascade that researchers want to map before they can predict it.
- The team is turning toward brain imaging and drug treatment to find what drives each pattern, aiming for monitoring tailored to each patient.
- The path to personalized care is still open and unproven, with much research needed before these subtypes reshape how clinicians act.
Across the long rhythm of the menstrual cycle, a quiet truth is emerging about premenstrual dysphoric disorder: it does not arrive in one shape for everyone. Through two months of daily diaries kept by 90 women with the condition and a comparison group of 40 without it, researchers at Uppsala University, led by Erika Comasco, have begun to sort the suffering into three distinct patterns, each with its own timing and intensity. The reasons behind these patterns remain unknown, and the work of uncovering them, in the body and the brain, is only beginning. Still, the finding offers the hope that a condition once met with a single, blunt description may someday be understood with the particularity it deserves.
For two months, 90 women with premenstrual dysphoric disorder recorded each day how anxious, depressed, irritable and moody they felt, and how strongly. Forty healthy women kept the same diaries as a point of comparison. Together, these daily entries became the foundation of a new study in Nature Communications, which finds that PMDD does not follow one universal pattern.
PMDD is a severe form of premenstrual syndrome, tied to the menstrual cycle, with symptoms that can begin soon after ovulation and last until menstruation starts. Using advanced statistical methods, the researchers traced when each symptom rose and faded across the cycle, and how a change in one symptom rippled into the others. Three subtypes emerged: severe early-onset PMDD, with symptoms peaking about five days before menstruation; severe late-onset PMDD, peaking near the start of the period; and moderate late-onset PMDD, peaking around four days before, and less intense.
"Our results show that PMDD does not look the same for everyone," Comasco said. Two people with the same diagnosis can differ in when symptoms begin, how severe they become, and when they ease. The researchers also saw that anxiety tended to be followed by irritability, depression and mood swings, though more work is needed before this can guide predictions for any one woman.
The study does not yet explain why the subtypes exist. Comasco's group plans to explore the biology and brain function behind them, combining cycle timing with brain studies and drug treatment. Some participants had already taken part in an imaging study showing that an SSRI reduces irritability and anger, and that a region called the anterior insula, involved in reactive emotion, became less reactive after treatment. If individual patterns can be identified, clinicians might tailor monitoring and care, and women might better anticipate when their symptoms will worsen. The next step is discovering what drives these three patterns.
For two months, 90 women with premenstrual dysphoric disorder kept a diary. Each day they recorded how anxious, depressed, irritable and moody they felt, and how severe those feelings were. A group of 40 healthy women did the same, providing a comparison. Those daily entries are the foundation of a new study in Nature Communications, which finds that PMDD does not follow one universal pattern.
PMDD is a severe form of premenstrual syndrome that affects women in their childbearing years. It differs from other mood disorders in being tied to the menstrual cycle: symptoms can begin shortly after ovulation and continue until menstruation starts.
Using advanced statistical methods, the researchers examined when each symptom appeared and faded across the cycle. They also looked at how a change in one symptom affected the others. From the women's responses, three subtypes emerged.
The first is severe PMDD with early onset. Symptoms begin roughly two weeks before menstruation and are strongest about five days before it. The second is severe PMDD with late onset, in which symptoms start to climb about 10 days before menstruation and peak around the start of the period. The third is moderate PMDD with late onset. Symptoms again begin rising about 10 days beforehand, but peak around four days before menstruation and are less severe than in the other two groups.
"Our results show that PMDD does not look the same for everyone," said Erika Comasco, professor of molecular psychiatry at Uppsala University, who led the study. Two people with the same diagnosis can differ in when symptoms start, how severe they get, and when they ease. Within a single person, different symptoms can also follow different patterns.
The researchers also saw a temporal interaction among the four most common symptoms. A rise in anxiety, for example, was followed by increased irritability, depressive symptoms and mood swings. This suggests the symptoms influence one another over time, though more research is needed before that knowledge can be used to understand or predict the course of PMDD in an individual.
The study does not explain why the subtypes exist. Comasco said her group's ongoing work will explore the biological mechanisms behind the different patterns and how they relate to brain function in women with PMDD, combining symptom timing across the cycle with brain studies and the effects of drug treatment. If individual patterns can be identified, she said, health care professionals could adapt how they monitor and treat each patient, and women might find it easier to anticipate when their condition tends to worsen.
Comasco also sees PMDD as a model for other conditions. Because the menstrual cycle is one of the body's most regular biological rhythms, symptom onset is more predictable than in illnesses such as depression. Studying it could inform treatment of other disorders and show how symptoms co-vary. Her team is currently studying women with ADHD, who commonly experience more pronounced premenstrual symptoms than others.
Some of the women in this study also took part in a brain imaging study the same group published midyear. It showed that treatment with an SSRI reduces irritability, anger and aggression in women with PMDD. When participants were exposed to social provocation, the anterior insula, a region involved in reactive aggression and in processing negative emotional states, stood out. After treatment with escitalopram it became less reactive, and stronger reactivity there had been linked to more irritability and anger. That suggests altered anterior insula reactivity may help explain why the women grew less irritable and angry on treatment.
The next step is working out what drives the three patterns in the brain and body.
Citazioni salienti
Our results show that PMDD does not look the same for everyone.— Erika Comasco, professor of molecular psychiatry, Uppsala University
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