Cycle × state · 6 min
PMS: what's typical and what's worth checking
Premenstrual syndrome (PMS) is recurring symptoms in the luteal phase (from ovulation to period) that ease with the first days of bleeding. Some form of it affects 70–90% of menstruating people. Typical — doesn't mean it should be dismissed.
Most common symptoms
Physical
- Breast tenderness or swelling.
- Bloating, water retention.
- Headaches, back pain, muscle aches.
- Fatigue out of proportion to sleep.
- Appetite swings, sometimes sugar or salt cravings.
- Acne, oily skin, dry skin.
Emotional and cognitive
- Irritability, shorter fuse.
- Tearfulness, heightened sensitivity.
- Anxiety, unease, tension.
- Reduced focus.
- Reduced motivation.
What causes PMS
The mechanism doesn't come down to "deficiency" or "excess" of any hormone. PMS only appears in ovulatory cycles — that is, the natural rise and fall of progesterone is needed. Allopregnanolone (a progesterone metabolite) affects GABA and serotonin. Some people are more sensitive to these fluctuations.
In anovulatory cycles (e.g. continuous contraception, sometimes perimenopause) PMS disappears or is much milder.
PMS vs PMDD — where's the line
PMS is unpleasant but manageable. PMDD disables functioning — relationships, work, decisions are actually disrupted. The line isn't fuzzy: PMDD has its own diagnostic criteria (DSM-5), requires 2 cycles of prospective tracking, and specific treatment. If suicidal thoughts appear, escalating anger leading to conflicts, or symptoms straining work — worth checking whether it's PMDD.
What has evidence
Good evidence
- Regular aerobic exercise 3–4×/week — affects both emotional and physical symptom intensity.
- Sleep 7–8 h, with regular hours in the luteal phase.
- Limiting alcohol and caffeine in the luteal phase.
- Calcium 1200 mg/day — documented effect in PMS.
- Magnesium 200–360 mg/day — helps with bloating, headache, irritability.
- Vitamin B6 (up to 100 mg/day) — helps mood, but watch for neuropathy at higher doses.
- Luteal-phase SSRI — for heavier PMS and PMDD.
- CBT, mindfulness — helps coping, doesn't reduce physical symptoms.
Weak or no evidence
- Evening primrose oil — most meta-analyses don't confirm an effect.
- Black cohosh — mainly for menopause, not PMS.
- "Hormone" supplements — careful, often unstudied.
What observation actually changes
Tracking symptoms over 2–3 cycles shows which days and which symptoms repeat. It doesn't eliminate PMS, but changes the interpretation: "I don't know what's wrong with me" becomes "it's day 24, irritability usually returns between day 22 and 26". Just knowing something is cyclical and will end reduces the extra anxiety around the symptoms.