PMS vs PMDD: the difference and how to manage both

In the week or two before your period, do you feel low, snappy, bloated, or tired? That's PMS — pre-menstrual syndrome — and up to 75% of women experience it in some form.

But for a smaller group — about 2–5% of women (some studies say up to 8%) — the symptoms are much worse, bad enough to affect work, relationships, and daily life. That's PMDD — pre-menstrual dysphoric disorder — and it's a recognised medical condition, not "just bad PMS". In India, PMDD is often under-diagnosed simply because awareness is low, both among women and doctors.

What causes it

Both PMS and PMDD are triggered by the normal drop in estrogen and progesterone (the two main female hormones) that happens after ovulation. Your body isn't doing anything wrong — some brains are just more sensitive to these swings, especially in the mood-regulating chemical serotonin.

The difference — a quick guide

The key sign of both — and what tells them apart from generalised anxiety or depression — is the timing. Symptoms appear only in the second half of your cycle (called the luteal phase — the ~14 days after ovulation) and lift once bleeding begins.

How to know which one you have

Track your mood daily for 2–3 full cycles. Rate anxiety, low mood, and irritability from 0–10. Also note the day of your cycle.

If the ratings clearly rise in the second half and drop the day your period starts, you have a cyclical pattern. If they're high all month, it's more likely another condition and worth speaking to a doctor about.

What actually helps — for PMS

• Regular movement. Walking, cycling, yoga — 30 minutes most days lifts mood and reduces bloating.
• Cut back on salt, caffeine, and alcohol in the second half of your cycle.
• Get 7–8 hours of sleep. Sleep loss makes PMS mood swings sharper.
• Calcium. Some older studies suggest ~1200 mg/day of calcium may reduce PMS symptoms. India's official recommendation (ICMR-NIN) is 1000 mg/day for adult women. Aim to get most of that from food — dairy, ragi, sesame, leafy greens — rather than pills.
• Vitamin B6 and magnesium may help mood and cramps — check with your doctor before supplements.

What actually helps — for PMDD

PMDD usually needs medical treatment. Options your doctor may consider:

• SSRIs (a type of antidepressant, like sertraline or fluoxetine) — they often start working within the first treated cycle, which is faster than for depression (where they take several weeks). Some women only take them in the second half of their cycle (called luteal-phase dosing) — this works, but continuous every-day dosing is slightly more effective.
• Combined birth control pills — those with drospirenone are best studied for PMDD.
• Cognitive Behavioural Therapy (CBT) — a type of talking therapy shown to reduce PMDD symptoms.

When to see a doctor

• You've had these symptoms for 2+ cycles and they affect your work, sleep, or relationships
• You've had thoughts of self-harm
• Home strategies aren't enough

Both PMS and PMDD are real and treatable. You're not being "dramatic". Bring your cycle tracker to your doctor — it's the most useful thing you can hand them.