Premenstrual Dysphoric Disorder (PMDD) is a severe form of PMS (premenstrual syndrome) that affects mood, behaviour, and physical wellbeing in the lead-up to a period.
While many women experience some premenstrual symptoms, PMDD is different, it can significantly disrupt daily life, relationships, and work.
What is PMDD?
PMDD is linked to sensitivity to normal hormonal changes during the menstrual cycle, particularly in the luteal phase (the 1–2 weeks before a period). It is not a hormone imbalance, but rather an increased brain sensitivity to these hormonal fluctuations.
What’s Happening in the Brain? (Why the Luteal Phase Feels So Different)
PMDD is not caused by abnormal hormone levels, ovulation and hormone production are normal. The difference lies in how the brain responds to these hormonal changes, particularly in the luteal phase (
After ovulation, progesterone levels rise. Progesterone is then broken down into a neuroactive substance called allopregnanolone (a brain-active metabolite of progesterone).
Allopregnanolone acts on the GABA-A receptor (a calming receptor in the brain that helps reduce anxiety and stabilise mood).
In most women, this has a soothing, anti-anxiety effect.
However, in women with PMDD, the brain appears to respond differently:
• The GABA-A receptor becomes less sensitive or reacts in an altered way
• Instead of feeling calm, women may experience increased anxiety, irritability, or agitation
• There is also evidence of altered serotonin function (a key mood-regulating neurotransmitter), which further contributes to mood symptoms
As progesterone and allopregnanolone levels rise and then fall in the late luteal phase, this fluctuating sensitivity can trigger
Symptoms
• Marked mood swings (sudden emotional changes)
• Irritability or anger (feeling easily triggered or overwhelmed)
• Low mood or depression (feeling flat, hopeless, or tearful)
• Anxiety or tension (feeling on edge or unable to relax)
• Fatigue (low energy)
• Sleep disturbance (poor sleep or insomnia)
• Physical symptoms such as bloating, breast tenderness, or headaches
Importantly, when hormone levels drop at the onset of menstruation, symptoms often rapidly improve — reinforcing the cyclical (monthly) nature of PMDD.
Diagnosis
PMDD is a clinical diagnosis (based on symptoms and pattern over time). Ideally, symptoms are tracked over at least two menstrual cycles using a symptom diary. This helps confirm the cyclical nature and distinguish PMDD from underlying depression or anxiety.
Management of PMDD
Treatment focuses on reducing symptom severity and improving quality of life, options include:
• Lifestyle measures (regular exercise, sleep, reducing alcohol and caffeine)
• SSRIs (selective serotonin reuptake inhibitors – a type of antidepressant), which can be taken continuously or just in the luteal phase to support brain chemistry .
Hormonal options: act by suppressing ovulation and reducing the hormone cycles.
• Combined oral contraceptive pill (the pill, particularly those containing drospirenone)
• Progesterone only pill – containing drospirenone only.
Second-line options:
• GnRH analogues (medications that switch off ovarian hormone production, creating a temporary menopause-like state, usually with add-back hormone therapy)
Psychological support (such as cognitive behavioural therapy) can also be helpful alongside medical treatment.
When to Seek Help or Refer
Referral to a gynaecologist or psychiatrist may be appropriate when:
• Symptoms are severe or impacting safety, work, or relationships
• There is diagnostic uncertainty
• First-line treatments are not effective
• There are co-existing mental health concerns
PMDD is real, common, and treatable.
If premenstrual symptoms are affecting quality of life, it’s worth seeking help, you don’t have to push through it each month.
