For two months, ninety women with premenstrual dysphoric disorder kept daily accounts of their moods, and the pattern they traced across their cycles suggests that a condition long described as a monthly storm is better understood as a set of distinct weather systems. Each woman's distress arrived and receded on its own timetable, shaped by when symptoms rose, how hard they struck, and how one feeling seemed to call up the next. Researchers at Uppsala University now sort these patterns into three groups, though they cannot yet say what drives the differences, leaving the question of why suffer
PMDD Is Not One Pattern: Study Identifies Three Symptom Subtypes Across the Menstrual Cycle
PMDD does not look the same for everyone.
Mark
So what is actually new here? People already knew PMDD follows the cycle.
Mimi
The cycle link is old. What's new is that the timing isn't uniform. Some women's symptoms start about two weeks before menstruation, others about ten days before, and the peaks differ too.
Mark
Three subtypes, then.
Mimi
Two severe, one moderate. The severe ones differ in onset and peak, and the moderate one peaks about four days before menstruation.
Luke
Before we get carried away, this is 90 women with PMDD and 40 controls, tracked for two months through self-reported diaries. That's a modest sample and subjective ratings.
Mark
Does it say why the subtypes exist?
Mimi
No. The study doesn't explain the cause. Comasco says the biology is the next question.
Luke
And the symptom interaction, anxiety followed by irritability, depression and mood swings, is described as a pattern. The researchers say it can't yet be used to predict an individual's course.
Mark
So the individualised treatment is a hope, not a result.
Luke
Right. Comasco says if future studies can identify these patterns in individuals. That's conditional.
Mimi
The SSRI imaging work gives a hint of where it could go. Escitalopram made the anterior insula less reactive and irritability dropped. Next they'll test whether subtypes respond differently.
Luke
Worth noting that's a separate study, so nothing here yet shows the subtypes differ in treatment response.
El Pulso
- Ninety women with PMDD recorded their moods daily for two months, and their diaries revealed that the disorder does not follow one script.
- Three subtypes emerged, two severe and one moderate, each with its own clock for when symptoms surge and when they fade.
- Anxiety rising in the diaries often preceded irritability, depression, and mood swings, suggesting symptoms feed one another across the cycle.
- The cause of these differences remains unknown, and researchers are racing to link the subtypes to brain function and treatment response.
- The goal is individualized monitoring and care, so clinicians and patients might one day anticipate when symptoms will worsen.
For two months, ninety women with premenstrual dysphoric disorder kept daily accounts of their moods, and the pattern they traced across their cycles suggests that a condition long described as a monthly storm is better understood as a set of distinct weather systems. Each woman's distress arrived and receded on its own timetable, shaped by when symptoms rose, how hard they struck, and how one feeling seemed to call up the next. Researchers at Uppsala University now sort these patterns into three groups, though they cannot yet say what drives the differences, leaving the question of why suffering takes these shapes open to the work that lies ahead.
For two months, ninety women with premenstrual dysphoric disorder sat down each day and wrote out how they felt. They rated their anxiety, depression, irritability and mood swings, and how intense each one was. Forty healthy women kept the same diaries as a comparison group. The records, now published in Nature Communications, show that PMDD does not run on a single schedule.
PMDD is a severe form of premenstrual syndrome, a mood disorder tied to the menstrual cycle that affects women in their childbearing years. Its defining feature is timing: symptoms can begin shortly after ovulation and persist until menstruation starts. Using statistical methods, the researchers mapped when each symptom rose and fell and how a change in one affected the others. Three subtypes emerged. Two are severe, one with early onset, peaking about five days before menstruation, and one with late onset, peaking at its start. The third is moderate, with late onset, peaking about four days before menstruation.
Erika Comasco, who led the study at Uppsala University, said two people with the same diagnosis can differ in when symptoms begin, how severe they become, and when they end. The team also found that the four most common symptoms influence one another over time: a rise in anxiety tended to be followed by more irritability, depression and mood swings. The researchers caution that much more work is needed before this can predict an individual's course, but if it does, clinicians could tailor monitoring and treatment, and patients could better anticipate hard weeks.
The study cannot explain why the subtypes differ. The group plans to combine these findings with brain studies and drug treatment data. Some participants also took part in an earlier imaging study showing that an SSRI reduced irritability and aggression, and that the anterior insula became less reactive to provocation after treatment. The next step is to test whether the three subtypes differ in brain function and in how women respond to care.
For two months, 90 women with premenstrual dysphoric disorder sat down each day and wrote out how they felt. They rated their anxiety, depression, irritability and mood swings, and how intense each one was. Forty healthy women did the same, serving as a comparison group. Those diaries have now produced a finding published in Nature Communications: PMDD does not run on a single schedule.
PMDD is a mood disorder tied to the menstrual cycle, and it is a more severe form of premenstrual syndrome. It affects women in their childbearing years. What sets it apart from other mood disorders is the timing. Symptoms can begin shortly after ovulation and last until menstruation starts.
Using advanced statistical methods, the researchers looked at when each symptom appeared and when it 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. Symptoms start to climb about ten days before menstruation and peak around its beginning. The third is moderate PMDD with late onset. Symptoms also start rising about ten days out, but they peak about four days before menstruation and are milder than in the other two groups.
Erika Comasco, who led the study and is a professor of Molecular Psychiatry at Uppsala University, said the results show PMDD does not look the same for everyone. Two people with the same diagnosis can differ in when symptoms start, how severe they become and when they end. Within one person, different symptoms can follow different patterns. She said the hope is for a more nuanced understanding of the condition and, eventually, more individualised monitoring and treatment.
The study also found a temporal interaction among the four most common symptoms. A rise in anxiety, for example, was followed by increases in irritability, depressive symptoms and mood swings. That suggests symptoms influence one another over time. The researchers stress that more work is needed before this can help understand or predict the course of PMDD in an individual. If future studies can identify these patterns in particular people, Comasco said, clinicians could adapt how they monitor and treat them, and patients might find it easier to anticipate when their condition tends to worsen.
The study cannot say why the subtypes differ. Comasco described the biological mechanisms, and how they relate to brain function in women with PMDD, as an important question in the group's ongoing research. They plan to combine what is known about symptom development across the cycle with brain studies and the effects of drug treatment.
The team sees wider uses too. The menstrual cycle is one of the body's most regular biological rhythms, which makes PMDD a useful model. In depression and other mental illnesses, there is no comparable way to predict when symptoms will occur. Comasco noted that women with ADHD commonly experience more pronounced premenstrual symptoms, which the group is currently studying.
Some of the women in this study also took part in a brain imaging study the same group published mid-year. It showed that treatment with an SSRI reduced irritability, anger and aggression in women with PMDD. Scans showed the anterior insula, a region involved in reactive aggression and in processing negative emotions after provocation, became less reactive to social provocation after treatment with escitalopram. Stronger reactivity there was linked to more irritability and anger, which suggests the change may help explain the improvement.
The group's next step is to test whether the three subtypes differ in brain function and in how women respond to treatment.
Citas Notables
PMDD does not look the same for everyone; even with the same diagnosis, symptoms can start at different points in the cycle and differ in severity and offset.— Erika Comasco, Professor of Molecular Psychiatry, Uppsala University
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