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PMS vs PMDD: what's the difference?
PMS and PMDD share many symptoms, but differ in intensity and impact. While PMS affects up to 75% of people with periods and typically causes mild to moderate mood and physical changes, PMDD is a more severe, clinically recognised condition that can cause extreme emotional distress, depression, anxiety, and in some cases suicidal thoughts. Both are driven by hormonal changes in the luteal phase - but PMDD disrupts daily life in a profound way. Understanding your symptoms, tracking their timing, and seeking medical advice are the key steps toward getting the right diagnosis and support.
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🌿 Key takeaways
PMS vs PMDD: what to know
- PMS affects up to 75% of people with periods; PMDD affects 2 to 8% and is classified as a depressive disorder in the DSM-5
- Both conditions cause physical, psychological, and behavioural symptoms in the luteal phase - the difference is severity and functional impact
- People with PMDD are at a significantly higher risk of suicidal thoughts - this is a recognised symptom, not a character flaw
- Diagnosis for both conditions relies on tracking symptoms daily for at least two cycles and evidencing the cyclical pattern to a GP
- Treatment options exist for both PMS and PMDD - from lifestyle changes and supplements to SSRIs and talking therapies
What is PMS?
PMS (premenstrual syndrome) is clinically defined as a range of physical, psychological, and behavioural symptoms that occur in the luteal phase - the two weeks before a period. There are thought to be over 150 possible symptoms, which can disrupt daily functioning, work, school, and relationships. Symptoms typically resolve within a few days of the period beginning.
🧠 In simple terms: PMS is the name for the cluster of symptoms that appear in the two weeks before your period and ease once it starts. If it happens every cycle and affects how you function, it is PMS - and it is real, even if it has been dismissed before.
What is PMDD?
PMDD (premenstrual dysphoric disorder) is sometimes described as "severe PMS", but it is more accurate to understand it as a distinct condition. The Diagnostic and Statistical Manual of Mental Disorders (DSM-5) classifies it as a depressive disorder. Like PMS, symptoms begin one to two weeks before a period and resolve within a few days of it starting - but they are far more severe and disruptive.
People with PMDD frequently report significant damage to relationships, needing time off work or study, and in some cases suicidal thoughts or ideation.
⚠️ If you are struggling right now: If you are experiencing suicidal thoughts, please reach out. Samaritans are available 24/7 on 116 123 (free, UK). You can also text SHOUT to 85258 for free text-based support. If you are in immediate danger, call 999 or go to A&E.
What are the symptoms of PMS and PMDD?
Each person's experience will be different. The following covers the most common symptoms across three categories - but the list is not exhaustive.
Physical symptoms
- Hunger and food cravings
- Hot flushes
- Intense period pains
- Headaches, dizziness, and fainting
- Cramps, bloating, and constipation
- Heart palpitations
- Bruising or numbness in arms and legs
- Nausea
- Acne or aggravation of existing skin conditions
Psychological symptoms
- Irritability
- Difficulty concentrating
- Feelings of depression
- Feelings of anxiety
- Confusion and forgetfulness
Behavioural symptoms
- Lack of sleep or insomnia
- Social withdrawal
- Reduced sex drive or libido
- Appetite changes
- Emotional sensitivity and crying
The key difference between PMS and PMDD is intensity. Painful cramps can become debilitating. Food cravings can feel impossible to manage. Low mood can feel like severe depression or extreme anxiety. With PMDD, symptoms do not just discomfort - they overwhelm.
Perhaps the most serious symptom of all is feeling suicidal or experiencing suicidal thoughts. This is a recognised, documented feature of PMDD. If you or someone you know is experiencing this, please seek support immediately.
⚠️ Need support now? If you are having suicidal thoughts and are worried you may act on them: call 999, go to A&E, or contact the Samaritans on 116 123 (free, 24/7). You can also text SHOUT to 85258.
What is the difference in prevalence?
| Condition | Prevalence | Notes |
|---|---|---|
| PMS | Up to 75% of people with periods | Studies vary widely (32% to 90%) due to under-research and no physical diagnostic test |
| PMDD | 2% to 8% of people with periods | Less common than PMS but more severe; prevalence rates also vary due to diagnostic challenges and frequent misdiagnosis |
Regardless of the exact numbers, one thing is certain: if you are experiencing these symptoms, you are not alone.
How are PMS and PMDD diagnosed?
PMS is diagnosed by a GP after you have evidenced that you experience symptoms in the one to two weeks before your period consistently over two cycles, that the symptoms affect your daily life, and that they subside once your period begins.
The diagnosis for PMDD is similar but requires you to evidence a specific combination of symptoms - a minimum of five, at least one of which must be psychological.
🌿 What to do now: Start noting down the symptoms you experience, when they happen, and how severe they feel. Take this record to your GP - or use The Evelyn Premenstrual Health Tracker to log symptoms consistently across your cycle in a format that is easy to share with a healthcare provider.
What are the treatments for PMS and PMDD?
Treatment options exist for both PMS and PMDD - finding the right one for you can involve some trial and error, so be patient with the process. People with PMDD are more likely to be offered antidepressants as a first-line treatment. For PMS, contraceptives or alternative therapies may initially be recommended.
| Category | Options |
|---|---|
| Non-medical | Dietary changes; reducing sugar, caffeine, and alcohol; regular exercise; stress management (meditation, yoga); vitamin supplements; Evelyn's Supplement Routine |
| Medical | CBT (talking therapy); SSRIs; combined oral contraceptives; anti-inflammatory medicines; diuretics |
| Alternative | Aromatherapy; acupuncture; reflexology |
Final thoughts
Even though PMS and PMDD are not always easy to diagnose, the symptoms are very real and experienced by millions of people around the world. If you recognise these symptoms in yourself - and particularly if they occur cyclically before your period - you may have PMS or PMDD.
You are not alone, and there are treatment options to help. For more information, explore Evelyn's articles on PMS, PMDD, and visiting a healthcare professional.
Disclaimer: This content is for informational purposes only and is not intended as medical advice. Always speak to a qualified healthcare professional about any health concerns.
