The timing rule
Both PMS and PMDD are luteal-phase conditions - they only happen in the week or two before your period and clear within a few days of bleeding starting. If your symptoms are present at other times of the cycle, something else is going on (anxiety, depression, thyroid, perimenopause). The quiz flags this explicitly.
What to do next
If your result said PMDD evaluation is worthwhile, the highest-leverage prep is a daily symptom diary across 2 cycles. The menstrual cycle calculator gives you a framework. If perimenopause is on your radar, check the perimenopause quiz - shifts in hormonal sensitivity around 40+ can amplify what was previously mild PMS.
Frequently asked questions
What's the difference between PMS and PMDD?
PMS is the cluster of physical and emotional symptoms most people get in the week or two before their period. PMDD is a much more severe form - intense mood symptoms (anger, hopelessness, anxiety) that genuinely interfere with work, school, or relationships, every cycle, then lift within a few days of bleeding. PMDD affects roughly 3-8% of menstruators.
How is PMDD diagnosed?
A doctor will usually ask you to keep a daily symptom diary across 2 cycles (the DRSP or similar). The DSM-5 criteria require specific symptoms, a clear cyclical pattern, and significant functional impact. Diaries make the difference - retrospective recall isn't reliable enough.
What treatments work?
Evidence-backed options include SSRIs (taken daily or just in the luteal phase), combined oral contraceptives that suppress ovulation, GnRH agonists in severe cases, and CBT. Lifestyle (sleep, alcohol, exercise) helps but rarely on its own for PMDD.
These calculators give estimates based on cycle averages and standard formulas. They are for general information only and are not medical advice. For anything concerning your health or pregnancy, talk to a qualified healthcare provider.