PMS vs PMDD: What's the Difference?

12 min read
PMS vs PMDD: What's the Difference?

PMS and PMDD both cause recurring symptoms in the lead-up to a period, but they aren’t the same thing.

Premenstrual syndrome (PMS) can cause physical and emotional symptoms such as bloating, breast tenderness, irritability, headaches, tiredness and mood changes.

Premenstrual dysphoric disorder (PMDD) is a more severe premenstrual disorder with specific diagnostic criteria. Mood symptoms such as depression, anxiety, irritability or marked mood swings can significantly interfere with work, relationships, study and everyday life.

One of the most useful clues is timing. PMS and PMDD symptoms follow a recurring relationship with the menstrual cycle, usually appearing after ovulation and improving within the first few days after the period begins.

If emotional symptoms are present throughout the month and simply become worse before your period, that may be a different pattern called premenstrual exacerbation, or PME.

Key takeaways

  • PMS and PMDD both follow a recurring premenstrual pattern, but PMDD has specific diagnostic criteria and causes significant functional impairment.
  • PMDD is recognised in the DSM-5-TR as a mental health disorder.
  • PMDD isn’t thought to result from simply having too much or too little oestrogen or progesterone. Research points instead to altered sensitivity to normal hormonal and neurosteroid fluctuations.
  • Prospective daily symptom tracking over at least two menstrual cycles is recommended when confirming PMDD.
  • Symptoms that occur throughout the month but worsen before menstruation may represent premenstrual exacerbation rather than PMDD.
  • Effective PMDD treatments include SSRIs and, for some people, hormonal treatments.
  • Severe premenstrual depression, hopelessness or thoughts of self-harm deserve prompt support rather than being dismissed as “just PMS”.

On this page

What is PMS?

Premenstrual syndrome (PMS) describes recurring physical, emotional or behavioural symptoms that develop during the premenstrual part of the menstrual cycle and improve after menstruation begins.

Premenstrual symptoms are very common, but having an occasional craving, headache or irritable day before your period doesn’t automatically mean you have PMS.

The recurring pattern matters.

Symptoms can include:

  • bloating
  • breast tenderness
  • headaches
  • fatigue
  • food cravings or appetite changes
  • sleep changes
  • irritability
  • low mood
  • anxiety or tension
  • difficulty concentrating

PMS exists across a range of severity. For some people symptoms are relatively mild. For others they can have a noticeable impact on work, relationships, sleep or everyday life.

If mood symptoms are severe or repeatedly make it difficult to function, PMDD should be considered.

What is PMDD?

Premenstrual dysphoric disorder (PMDD) is a clinically recognised disorder involving severe recurring emotional, behavioural and physical symptoms associated with the menstrual cycle.

Healthdirect estimates that around 8 in every 100 women experience PMDD, although research estimates vary depending on how strictly the diagnostic criteria and prospective symptom tracking are applied.

Common PMDD symptoms include:

  • marked mood swings
  • intense irritability or anger
  • significant depression or hopelessness
  • pronounced anxiety or tension
  • feeling overwhelmed or out of control
  • difficulty concentrating
  • loss of interest in usual activities
  • low energy
  • changes in sleep or appetite

Physical symptoms such as breast tenderness, bloating, headaches and joint or muscle pain can occur too.

The defining feature isn’t simply having a bad week before your period. The symptoms follow a characteristic cycle and are severe enough to cause significant distress or interfere with daily functioning.

PMS vs PMDD: what’s the difference?

PMS PMDD
Timing Symptoms recur before menstruation and improve after it begins Symptoms typically emerge during the luteal phase and improve within the first few days after menstruation begins
Symptoms Physical and/or emotional symptoms At least five symptoms are required for DSM diagnosis, including at least one core mood symptom
Mood symptoms May include irritability, low mood or anxiety Marked mood swings, irritability, depression or anxiety are central to diagnosis
Impact Ranges from mild to significantly troublesome Causes clinically significant distress or interference with work, relationships or daily life
Formal DSM diagnosis No Yes
Prospective tracking Useful for identifying the pattern Recommended over at least two symptomatic cycles to confirm the diagnosis

 

So PMDD isn’t simply “PMS but worse”. There is overlap, but PMDD has a particular symptom pattern and diagnostic criteria.

PMDD vs premenstrual exacerbation

This distinction is important and often overlooked.

With PMDD, symptoms develop in relation to the menstrual cycle and there is usually a period after menstruation when symptoms are minimal or absent.

With premenstrual exacerbation (PME), another condition is present throughout the month but becomes noticeably worse before menstruation.

For example, someone with depression, anxiety, ADHD or another mental health condition may notice a significant premenstrual worsening of their existing symptoms.

That pattern can feel very similar to PMDD.

Tracking symptoms across the entire month, rather than only during the difficult days, helps a clinician distinguish between them.

What causes PMDD?

PMDD isn’t thought to be caused by simply having abnormally high or low hormone levels.

Research suggests that people with PMDD have an altered brain response to the normal hormonal changes that occur after ovulation.

One important area of research involves allopregnanolone, a neuroactive metabolite of progesterone that interacts with GABA receptors in the brain.

GABA is involved in regulating nervous-system activity, stress responses and emotional regulation.

In PMDD, the brain appears to respond differently to changing levels of allopregnanolone and other ovarian hormone-related signals across the menstrual cycle.

Serotonin and other neurotransmitter systems are also involved, which helps explain why selective serotonin reuptake inhibitors, or SSRIs, can be effective.

The biology is complex and still being studied. There isn’t one single hormone level or brain chemical that can be measured to diagnose PMDD.

How is PMDD diagnosed?

There is no blood test that confirms PMDD.

The diagnosis is based largely on which symptoms occur, how severe they are and, importantly, when they occur in relation to the menstrual cycle.

DSM criteria require at least five symptoms, with at least one involving:

  • marked mood swings or emotional sensitivity
  • marked irritability or anger
  • significantly depressed mood or hopelessness
  • marked anxiety or tension

Symptoms typically:

  • occur during the final week before menstruation
  • begin improving within a few days after the period starts
  • become minimal or absent during the week after menstruation
  • cause significant distress or interfere with daily life

Prospective daily symptom tracking for at least two menstrual cycles is recommended to confirm that pattern.

This means recording symptoms as they happen rather than trying to remember several months afterwards.

You can start with Period Shop’s free downloadable period tracker. A doctor may also recommend a PMDD-specific daily symptom tool such as the Daily Record of Severity of Problems.

What else needs to be considered?

A clinician may also consider whether symptoms could be better explained by:

  • depression or anxiety
  • premenstrual exacerbation of another mental health condition
  • thyroid disorders
  • perimenopause
  • medication effects
  • other physical or mental health conditions

A blood test may sometimes be useful for investigating another possible cause, but it doesn’t diagnose PMDD itself.

How is PMDD treated?

PMDD is treatable, although finding the right approach can take some trial and adjustment.

Treatment may combine medication, hormonal management, psychological support and practical strategies rather than relying on one approach alone.

SSRIs

Selective serotonin reuptake inhibitors are among the most established treatments for PMDD.

Examples include sertraline and fluoxetine.

One unusual feature of PMDD treatment is that SSRIs can sometimes improve symptoms relatively quickly compared with their use for major depression.

Depending on the person and the medicine, they may be prescribed:

  • every day
  • during the luteal or premenstrual phase only

A prescriber can discuss the most appropriate approach and possible side effects.

Hormonal contraception

Hormonal treatment may help by suppressing or stabilising ovarian hormonal fluctuations.

Some combined oral contraceptive formulations containing drospirenone and ethinylestradiol have been specifically studied for PMDD, and some products are approved in Australia for treating PMDD symptoms in people who also want oral contraception.

Hormonal contraception doesn’t improve mood for everyone, so previous experiences and individual health risks matter when choosing a method.

Psychological support

Cognitive behavioural therapy and other psychological approaches may help people manage the emotional and practical impact of recurring symptoms.

This doesn’t mean PMDD is caused by negative thinking or can simply be talked away.

Therapy can help with emotional regulation, relationships, planning for difficult parts of the cycle and any mental health conditions occurring alongside PMDD.

Exercise, sleep and everyday support

Regular physical activity, adequate sleep and reducing avoidable stress may help some people manage symptoms and support general mental health.

These approaches are useful parts of care but shouldn’t be presented as substitutes for medical treatment when PMDD symptoms are severe.

Is PMDD linked with trauma?

Some research has found higher rates of childhood or early life trauma among people with PMDD.

One Australian study of 100 women diagnosed with PMDD through a specialist women’s mental health clinic found that 83% reported at least one form of early life trauma.

That is an interesting and important finding, but it doesn’t mean that trauma causes PMDD or that everyone with PMDD has experienced trauma.

The study involved a relatively small specialist-clinic population, and researchers are continuing to investigate how stress-response systems, trauma, genetics and sensitivity to reproductive hormone changes may interact.

If you have a trauma history and find that your mental health changes dramatically at particular points in your cycle, both parts of that experience deserve appropriate support.

When should you see a doctor?

Talk with your GP if premenstrual symptoms:

  • repeatedly interfere with work, study or relationships
  • cause severe depression, anxiety, rage or hopelessness
  • feel dramatically different from how you feel during the rest of your cycle
  • make everyday tasks or self-care difficult
  • appear to follow the same cycle pattern each month
  • are becoming harder to manage

Rather than simply saying “I get really bad PMS”, it can help to describe the timing and impact clearly.

For example, you might explain that you experience severe mood symptoms for around a week before your period and feel noticeably different again after menstruation begins.

Taking a couple of months of daily symptom records to your appointment can make that conversation much easier.

If you’re experiencing thoughts of suicide or self-harm

PMDD can sometimes involve very severe depression or thoughts of suicide or self-harm.

If this is happening, you don’t need to wait for your period to start or see whether the feeling passes before reaching out for support.

Lifeline provides free, confidential crisis support 24 hours a day on 13 11 14. If you feel you may act on these thoughts or you’re in immediate danger, call triple zero (000).

Frequently asked questions

What is the main difference between PMS and PMDD?

PMS can cause physical and emotional symptoms before a period and varies considerably in severity. PMDD has specific diagnostic criteria and involves severe cyclical symptoms, particularly mood symptoms, that cause significant distress or interfere with daily functioning.

Is PMDD just severe PMS?

They overlap, and PMDD is sometimes described as the severe end of the premenstrual-disorder spectrum, but PMDD isn’t diagnosed simply because PMS symptoms feel intense. It requires a specific pattern and number of symptoms, including at least one core mood symptom, together with significant functional impairment.

Can you have PMDD if your hormone tests are normal?

Yes. PMDD generally isn’t caused by abnormal levels of oestrogen or progesterone. Current research suggests the brain responds differently to normal reproductive hormone and neurosteroid fluctuations.

Can you have PMDD symptoms all month?

True PMDD usually includes a window during the menstrual cycle when symptoms are minimal or absent. If symptoms are present throughout the month but become worse before your period, premenstrual exacerbation of another condition may be more likely.

Do you need a blood test for PMDD?

No. There is no blood test that diagnoses PMDD. Blood tests may sometimes be used to investigate other possible causes of symptoms, while PMDD itself is diagnosed primarily through the symptom pattern and prospective tracking.

How long should you track symptoms for PMDD?

Prospective daily tracking across at least two symptomatic menstrual cycles is recommended to confirm the characteristic PMDD pattern.

Can PMDD change during perimenopause?

It can. Reproductive hormone patterns become less predictable during perimenopause, and people with a history of hormone-sensitive mood symptoms may notice changes in their experience. Significant new mood symptoms during perimenopause still deserve proper assessment rather than automatically being attributed to hormones.

Is PMDD linked with trauma?

Some studies have found an association between PMDD and higher rates of childhood or early life trauma, but this doesn’t establish that trauma causes PMDD. PMDD can occur with or without a trauma history.

What treatments work for PMDD?

SSRIs are among the most established treatments and may be prescribed continuously or during the luteal phase. Certain combined oral contraceptives can also help some people, particularly formulations containing drospirenone and ethinylestradiol. Psychological therapies and lifestyle support can be useful alongside medical treatment.

Can the pill make PMDD better or worse?

Both are possible. Certain combined contraceptive formulations have evidence for reducing PMDD symptoms, while some people experience mood changes with hormonal contraception. If your mood changed noticeably after starting or changing contraception, discuss the timing and formulation with your GP.

The pattern matters

The difference between PMS and PMDD isn’t about whether you’re “coping well enough” with your period.

It’s about the pattern, severity and impact of your symptoms.

If you regularly feel like a completely different version of yourself before your period and then notice those symptoms lift soon after menstruation begins, tracking that pattern can be an important first step towards getting the right support.

You don’t need to wait until symptoms become unbearable before raising them with a healthcare professional.

Related reading

Sources and further reading

This article provides general educational information and isn’t a substitute for individual medical or mental health advice.