PMDD
Premenstrual dysphoric disorder: a severe, cyclical form of PMS where mood symptoms seriously disrupt life in the luteal phase and ease within a few days of your period starting.
What does PMDD mean?
PMDD: Premenstrual dysphoric disorder: a severe, cyclical form of PMS where mood symptoms seriously disrupt life in the luteal phase and ease within a few days of your period starting.
How it is used in the Splash library
For people with PMDD, that is not an exaggeration.
From “PMDD: when PMS turns the volume to max”Name what you are wondering about: “Could this be endometriosis / PMDD / my thyroid?”
From “How to talk to your doctor (and be heard)”But for a good number of people, and for the minority with PMDD, the pattern is real and sometimes severe.
From “Why your mood shifts across the cycle”For PMS and PMDD, the NHS says a GP may suggest hormonal medicine such as the combined pill, CBT, or antidepressants, and may refer you to a specialist if these do not help.
From “When sadness is more than PMS”Severe cyclical mood symptoms can be PMDD, which is treatable.
From “Getting mental health help in the UK”
PMDD explained
PMDD (premenstrual dysphoric disorder) is a severe form of premenstrual symptoms, mainly affecting mood. It is a recognised medical condition, not a character flaw or "bad PMS".
It is thought to be caused by an unusual sensitivity in the brain to the normal hormone changes after ovulation. Hormone levels themselves are usually normal (IAPMD).
What's typical
PMDD affects an estimated 3 to 8% of people who have periods. Symptoms appear in the week or two before a period and lift within a few days of it starting.
They can include intense sadness or hopelessness, anxiety, irritability or anger, feeling overwhelmed, difficulty concentrating, and physical symptoms like bloating or breast pain.
Diagnosis is based on tracking symptoms daily for at least two cycles, for example with the DRSP chart. Treatments include SSRIs, the combined pill, CBT and, in some cases, specialist hormone treatments (RCOG).
When to talk to a GP, nurse or pharmacist
- You have thoughts of self-harm or suicide. Get help now: call 999, go to A&E, or contact Samaritans on 116 123.
- Premenstrual symptoms are affecting your relationships, work or study.
- Treatments you have tried for PMS haven't helped. Bring your symptom tracking to a GP.
In the UK you can call NHS 111 for advice at any time. In an emergency call 999 (UK) or 911 (US). This is general information, not medical advice.
Where it comes up
Sources
Sources checked October 2026.
See it in your own cycle.
Log a few periods and Splash shows your patterns, privately, on your phone. Free, no account.