gynecology
PMS and PMDD: Managing Premenstrual Symptoms
Premenstrual syndrome affects a large majority of people who menstruate to some degree. A much smaller group — around 3–8% — have premenstrual dysphoric disorder (PMDD), which is severe enough to damage relationships, work, and mental health.
The distinction matters, because the treatments differ.
This page previously carried the wrong article. Under this title and URL, the site published content about endometriosis — a different condition with different treatment. That has been corrected: this is now a genuine PMS article, and endometriosis has its own page.
What PMS is
PMS is a cluster of physical and emotional symptoms occurring in the luteal phase — the roughly two weeks between ovulation and your period — that resolve within a few days of bleeding starting.
That timing is the diagnosis. Symptoms that are present all month are not PMS, however severe. Symptoms that worsen premenstrually but never fully go away are usually premenstrual exacerbation of an underlying condition — depression, anxiety, migraine, IBS, or a thyroid disorder — which is a different problem needing different treatment.
Common symptoms
Physical: bloating, breast tenderness, headaches, joint or muscle aches, fatigue, appetite changes and food cravings, disturbed sleep, acne.
Emotional and cognitive: irritability, mood swings, low mood, anxiety or feeling on edge, tearfulness, difficulty concentrating, loss of interest, feeling overwhelmed.
PMS or PMDD?
PMDD is a distinct diagnosis in the DSM-5, not just severe PMS. It requires at least five symptoms in the final week before the period, with at least one being a core mood symptom:
- Marked mood swings, sudden sadness, or rejection sensitivity
- Marked irritability, anger, or increased conflict
- Marked depressed mood, hopelessness, or self-critical thoughts
- Marked anxiety, tension, or feeling keyed up
Plus additional symptoms such as loss of interest, difficulty concentrating, fatigue, appetite change, sleep disturbance, feeling overwhelmed, or physical symptoms — and crucially, significant interference with work, school, or relationships.
PMDD is not a character flaw or an overreaction. It reflects an abnormal sensitivity to normal hormonal fluctuation. It carries a genuinely elevated risk of suicidal ideation, which is a reason to treat it properly rather than wait it out.
If you are having thoughts of harming yourself, call or text 988 (Suicide and Crisis Lifeline) or go to an emergency department. Do not wait for your period to start.
Tracking: the part that is actually required
Diagnosis of PMS or PMDD requires prospective daily symptom tracking across at least two consecutive cycles. Recalling how you felt last month is unreliable — memory is shaped by how you feel now.
Record daily: your main symptoms, their severity on a 0–3 scale, and whether you are bleeding. Any period-tracking app with a symptom log works, as does paper.
Two cycles of tracking will do more for your diagnosis than any test, and it distinguishes PMS from premenstrual exacerbation of an underlying condition — which is the distinction that changes treatment.
What actually helps
Lifestyle measures
Modest but real, and the reasonable starting point for mild symptoms:
- Regular aerobic exercise — one of the better-supported interventions for premenstrual mood symptoms.
- Sleep regularity — irregular sleep amplifies premenstrual mood symptoms.
- Reducing alcohol, which worsens both mood and sleep in the luteal phase.
- Reducing caffeine and salt if anxiety, breast tenderness, or bloating are prominent.
- Regular meals — long gaps worsen irritability and cravings.
- Calcium, around 1000–1200 mg daily, has reasonable evidence for reducing premenstrual symptoms.
- Cognitive behavioural therapy has good evidence, particularly for PMDD, and is worth pursuing rather than treating as a last resort.
Evidence for vitamin B6, magnesium, chasteberry, and evening primrose oil is weaker and mixed. B6 in particular should not be taken in high doses long-term — it can cause peripheral neuropathy.
Medication
- SSRIs are first-line for PMDD and effective for severe PMS. Two things surprise people: they work within days rather than the weeks required for depression, and they can be taken only in the luteal phase — from ovulation to the start of bleeding — rather than continuously. Continuous dosing is also an option if the intermittent regimen is hard to time.
- Combined hormonal contraception, taken continuously without a placebo week, suppresses ovulation and therefore the hormonal fluctuation driving symptoms. Drospirenone-containing pills have specific evidence for PMDD.
- GnRH agonists with add-back therapy — for severe PMDD that has not responded to the above. Effective, but reserved because of the side-effect profile.
- Diuretics — occasionally used for severe fluid retention.
Treatment is often trial and adjustment. If the first approach does not work, that is expected, not a dead end.
When to see us
- Symptoms that damage your relationships, work, or parenting
- Symptoms that are not clearly confined to the luteal phase — the diagnosis may be something else
- Symptoms not responding to lifestyle measures
- Any thoughts of self-harm — urgently
Bring your two cycles of tracking. It will make the appointment substantially more productive.
Medical disclaimer
This article is general health information, not medical advice for any individual. PMS and PMDD overlap with depression, anxiety, and thyroid disease, and distinguishing them requires proper evaluation. If you are in crisis, call or text 988 or go to an emergency department.