PMS vs PMDD: Symptoms and When to Get Help

PMS is a set of physical and emotional symptoms that show up in the one to two weeks before a period and usually ease once bleeding starts. PMDD (premenstrual dysphoric disorder) is a much rarer, more severe form where mood symptoms like intense irritability, anxiety, or hopelessness disrupt daily life. If your premenstrual symptoms feel unmanageable, that's a reason to see a doctor, and there are effective treatments.

Quick summary: PMS is common and usually mild to moderate. PMDD is a severe form that affects fewer than 5% of women of childbearing age and is treatable. Track symptoms for a cycle or two, and see a doctor if symptoms affect your daily life. If you have thoughts of suicide, call or text 988 (US) right away.

What is PMS?

MedlinePlus describes PMS as a group of physical and emotional symptoms that start one to two weeks before a period and typically ease once bleeding starts. Severity ranges from mild to severe, and the exact cause isn't known, though shifting hormone levels likely play a role.

Common symptoms, per MedlinePlus, the NHS, and the Office on Women's Health:

• Physical: breast tenderness, bloating, headaches, backache, constipation or diarrhea, acne, food cravings
• Emotional or mental: irritability, mood swings, low mood, anxiety, crying spells, sleep changes, trouble concentrating

Most people have some symptoms at some point, and they can vary from month to month. Not everyone gets them.

What is PMDD?

The Office on Women's Health calls PMDD a more severe form of PMS. Mayo Clinic describes it as a severe, sometimes disabling extension of PMS. Symptoms usually appear in the week or two before a period and ease within a few days after it starts.

Per the Office on Women's Health, PMDD symptoms can include:

• Lasting irritability or anger
• Sadness or despair, which may include thoughts of suicide
• Tension, anxiety, panic attacks, and frequent mood swings or crying
• Low interest in daily activities and relationships
• Trouble focusing and low energy
• Food cravings or binge eating, trouble sleeping, and feeling out of control
• Physical symptoms like cramps, bloating, breast tenderness, headaches, and joint or muscle pain

The key difference is severity. With PMDD, mood symptoms can damage relationships, work, or school.

PMS vs PMDD at a glance

	PMS	PMDD
How common	Most people have some symptoms	Fewer than 5% of women of childbearing age
Mood symptoms	Mild to moderate	Severe (intense anger, despair, anxiety)
Daily life	Usually manageable	Can disrupt work, school, relationships
Timing	1 to 2 weeks before period, ease after it starts	Same pattern, but more intense
Treatment	Self-care, sometimes medication	Often medication and/or therapy with a doctor

How PMDD is diagnosed

There's no single test for PMS or PMDD. According to the Office on Women's Health and Cleveland Clinic:

• A provider reviews your health history and does a physical exam.
• You may be asked to track symptoms over one or two cycles in a calendar, diary, or app.
• Diagnosis requires five or more PMDD symptoms, including at least one mood-related symptom.
• Providers also rule out other conditions such as anxiety, depression, or reproductive disorders.

Keep in mind that PMS can overlap with depression, anxiety, and other conditions, and Mayo Clinic notes that the hormonal changes that trigger a period may worsen symptoms of mood disorders that are already there. That's one reason a proper evaluation matters.

What helps

For PMS

The Office on Women's Health and the NHS suggest:

• Regular aerobic exercise throughout the month
• Healthy eating, and cutting back on caffeine, salt, and sugar in the two weeks before your period
• About eight hours of sleep
• Stress management, like journaling, yoga, or meditation
• Not smoking, and limiting alcohol
• Over-the-counter pain relievers for cramps, headaches, or backache

Calcium and vitamin B6 have some evidence of benefit, according to the Office on Women's Health. Evidence for other supplements and herbal remedies is mixed, and they can interact with medicines, so check with a doctor or pharmacist first.

For PMDD

Treatment options listed by the Office on Women's Health and Cleveland Clinic include:

• SSRI antidepressants (sertraline, fluoxetine, and paroxetine are FDA-approved for PMDD)
• A birth control pill with drospirenone and ethinyl estradiol, which is FDA-approved for PMDD
• Healthy habits, stress management, therapy, and support groups

Note that MedlinePlus says hormonal birth control can sometimes worsen emotional symptoms, so it's worth discussing with a doctor.

When to see a doctor

Talk to a doctor or nurse if:

• Your symptoms bother you or affect your daily life
• Lifestyle changes haven't helped (the NHS says a GP can suggest options)
• You think it might be PMDD

Bring your symptom diary. The NHS suggests keeping one for at least two cycles.

If you have thoughts of suicide or self-harm

Thoughts of suicide can be a symptom of PMDD, and untreated PMDD can lead to depression, per Cleveland Clinic. You deserve help right now.

• US: Call or text 988 for the Suicide & Crisis Lifeline, free, confidential, and available 24/7. Chat is also available at 988lifeline.org. If you might hurt yourself or someone else, call 911.
• UK: If you have PMDD symptoms and feel suicidal, the NHS says to call 999 or go to A&E.
• Tell someone you trust, and contact your doctor as soon as you can.

Supporting someone with PMDD

If you're a partner reading this, believe her, avoid blaming moods on her period, and encourage her to get help. See how to support your partner on her period and mood changes before your period.

For the broader cycle context, check out the luteal phase guide.

Where Mochi Moon fits

Tracking symptoms and moods is the most helpful thing you can bring to a doctor. Mochi Moon lets you log mood, energy, sleep, and symptoms across your cycle on your iPhone, with your data staying on your device. It's a tracking tool and can't diagnose anything, so please see a healthcare professional for how you feel.

This article is general information, not medical advice.