"It is just PMS" — the phrase that delays diagnosis

PMDD — premenstrual dysphoric disorder — affects approximately 5% of women of reproductive age. That is 1 in 20. Yet most women with PMDD spend years being told it is "just PMS," being prescribed antidepressants without a proper evaluation, or simply being told to cope. Understanding the difference between PMS and PMDD is the first step toward getting the right support. ---

What is PMS?

Premenstrual syndrome (PMS) refers to a range of physical and emotional symptoms that occur in the 1 to 2 weeks before menstruation and resolve when your period begins. Common PMS symptoms:
  • Bloating and water retention
  • Breast tenderness
  • Mild mood changes — feeling more irritable or emotional than usual
  • Fatigue
  • Food cravings
  • Mild cramps
  • Headaches
  • Difficulty concentrating
PMS affects up to 75% of women at some point. Symptoms are real and can be uncomfortable — but they are generally manageable and do not significantly disrupt daily life. ---

What is PMDD?

Premenstrual dysphoric disorder (PMDD) is a severe, cyclical mood disorder tied to the hormonal changes of the menstrual cycle. It is classified in the DSM-5 (the diagnostic manual for mental health conditions). PMDD is not "bad PMS." It is a different condition. PMDD symptoms must include at least one of:
  • Marked mood swings (sudden sadness, tearfulness)
  • Marked irritability or anger — often causing interpersonal conflict
  • Marked depressed mood, feelings of hopelessness, or self-deprecating thoughts
  • Marked anxiety, tension, or feeling on edge
Plus five or more of:
  • Decreased interest in usual activities
  • Difficulty concentrating
  • Lethargy or low energy
  • Changes in appetite, overeating, or specific food cravings
  • Hypersomnia (sleeping too much) or insomnia
  • Feeling overwhelmed or out of control
  • Physical symptoms: breast tenderness, bloating, joint or muscle pain
The key distinction: PMDD symptoms are severe enough to disrupt work, relationships, and daily functioning. They appear in the luteal phase (after ovulation) and resolve within a few days of menstruation starting. ---

The critical difference: severity and function

The line between PMS and PMDD is not about which symptoms you have — it is about how severe they are and whether they interfere with your life. PMS: You feel more tired and irritable than usual. You prefer to stay in. You might snap at someone. You feel better when your period starts. PMDD: You cannot go to work. You withdraw completely from family and friends. You feel like a completely different person — one you do not recognise. Relationships suffer. You may have thoughts of hopelessness or not wanting to be here. And then your period starts, and within 48 hours, you feel completely fine again. That cyclical nature — severe symptoms that lift completely with menstruation — is the hallmark of PMDD. ---

How to know which one you have

The only way to distinguish PMS from PMDD is to track your symptoms daily for at least 2 full cycles. You are looking for:
  • Timing: do symptoms appear consistently in the luteal phase (after ovulation, before your period)?
  • Severity: do they significantly disrupt your daily functioning?
  • Resolution: do they improve within a few days of your period starting?
  • Pattern: does this happen every cycle, not just occasionally?
Luna lets you log your mood, energy, and emotional symptoms every day alongside your cycle data. After 2 months, you will be able to see exactly which days your symptoms peak and how they relate to your cycle phase. ---

Getting a diagnosis

If you suspect PMDD, take your tracked symptom data to a doctor — ideally a gynaecologist or psychiatrist familiar with reproductive mood disorders. A diagnosis of PMDD requires:
  • Symptoms present in most menstrual cycles over the past year
  • Symptoms severe enough to cause functional impairment
  • Symptoms not better explained by another condition (depression, anxiety disorder, etc.)
  • Confirmation that symptoms follow the luteal phase pattern
Treatment options for PMDD include:
  • SSRIs (taken continuously or only in the luteal phase) — often effective within days for PMDD, unlike the weeks needed for depression
  • Hormonal treatments: combined oral contraceptives, GnRH agonists
  • Lifestyle interventions: exercise, reduced caffeine, magnesium supplementation, CBT
  • In severe cases: oophorectomy (surgical menopause) — considered only after other treatments have failed
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You are not dramatic. You are not "too emotional."

PMDD is a medical condition with a biological basis. Research suggests it involves an abnormal sensitivity to normal hormonal fluctuations — particularly progesterone — rather than a hormone level problem. The symptoms are real. The suffering is real. And it is treatable. The first step is data. Track your cycle and symptoms with Luna for 2 months, generate your health report, and take it to a doctor. Start tracking free at freeperiodtracker.com.