PMDD (premenstrual dysphoric disorder), explained

PMDD, premenstrual dysphoric disorder, is a diagnosis in both the DSM-5-TR and the ICD-11, where it's coded GA34.41. It describes severe mood and physical symptoms that show up in the week or two before your period and fade within a few days of bleeding starting.

It's not the same as having a hard time before your period. The diagnosis requires at least five specific symptoms, and one of them has to be a mood symptom: mood swings or rejection sensitivity, irritability or anger, low mood, or anxiety. These need to appear in the final week of most cycles and stay minimal the week after your period starts.

The DSM-5-TR lists eleven possible symptoms, and a PMDD diagnosis needs five of them, including at least one mood symptom:

• Mood swings or feeling very sensitive to rejection
• Irritability or anger that affects other people
• Depressed mood, hopelessness or self-critical thoughts
• Anxiety, tension or feeling keyed up
• Less interest in usual activities
• Trouble concentrating
• Low energy, fatigue or exhaustion
• Changes in appetite, food cravings or overeating
• Sleeping too much or too little
• Feeling overwhelmed or out of control
• Physical symptoms such as breast tenderness, joint or muscle pain, bloating or weight gain

These need to appear in most cycles over the past year, cause real trouble at work, school or in relationships, and ease within a few days of your period starting. For the full breakdown of each symptom and what it looks like day to day, see the 11 DSM-5 symptoms of PMDD.

Estrogen and progesterone fall in the days before every period, for every cycling person. In PMDD, researchers think the brain reacts differently to that normal drop, rather than hormone levels themselves being abnormal (Schmidt et al., 1998, NEJM; Dubey et al., 2017, Molecular Psychiatry). One proposed mechanism involves allopregnanolone, a progesterone byproduct that acts on the same brain receptors as anti-anxiety medications, and how sensitized some brains are to its rise and fall each cycle.

Genetics plays a part too; PMDD tends to run in families. Life history matters as well. One 2025 systematic review found a reported history of trauma in 61% of women with PMDD, and those with PMDD were about twice as likely to report past trauma than women without it.

None of this means PMDD is only stress or only hormones. It's a specific, physical sensitivity with more than one thread feeding into it. For more on the biology, see what causes PMDD.

There's no blood test or scan for PMDD. Diagnosis rests on daily symptom ratings over at least two menstrual cycles, tracking mood and physical symptoms every day and matching the pattern to DSM-5-TR criteria: symptoms concentrated in the week before your period, and nearly gone within a few days of it starting.

A single bad month isn't enough on its own, and memory alone isn't reliable either; most people misjudge when their own symptoms actually start. That's why guidelines call for prospective, same-day tracking instead of looking back at the end of a cycle and guessing.

If this pattern sounds familiar, a short daily log for a cycle or two gives you and a doctor something concrete to work from. For a walk-through of getting that diagnosis, see how to get a PMDD diagnosis.

PMS and PMDD sit on a spectrum. The difference between them is severity and how each one is defined medically. PMS includes common physical or emotional symptoms in the one to two weeks before a period that ease once it starts. PMDD is a formal diagnosis that needs five symptoms, one of them a mood symptom, confirmed by daily tracking over two cycles.

The practical test is impact. PMS might make you uncomfortable or short-tempered. PMDD disrupts work, relationships or daily functioning in ways you can point to, and it's severe enough to meet DSM-5-TR criteria. Both patterns are real; what changes is how much each one takes from your day. The table below lays out the main differences side by side.

Guidelines recommend a short list of treatments with real evidence behind them. A doctor decides what fits your history and your symptoms.

• SSRIs: the first-line medication option. Some people take them every day; others take them only during the luteal phase (the one to two weeks before their period), which can work for PMDD because the symptom window is predictable.
• Certain hormonal contraceptives: some formulations, particularly those containing drospirenone, can reduce symptoms for some women.
• CBT (cognitive behavioral therapy): can help you build specific responses to a predictable pattern, separate from medication.

None of these work instantly, and what helps varies from person to person. Coping tools like breathing techniques or stepping away from a fight can help in the moment, but they're not a substitute for treatment aimed at the underlying pattern. For a full rundown of what's backed by evidence, see PMDD treatment: what actually helps.

On a hard PMDD day, the goal isn't to fix the whole month. It's to get through the next few hours without making things worse for yourself or a relationship you care about.

Simple, boring tools work best because they don't ask you to think clearly, which is hard when you're flooded. Leave a tense conversation and name a time you'll come back. Write down what actually happened before you decide what it means. Eat something, even if you don't want to; low blood sugar makes everything louder.

For more on handling an episode as it's happening, see in a PMDD episode right now, do this.

Most PMDD days aren't emergencies, even when they feel unbearable. The symptoms are real and often severe, but they also follow a predictable pattern that eases within days of your period starting.

Some people with PMDD notice thoughts of self-harm only in the days before their period, even when those thoughts are absent the rest of the month. That pattern fits PMDD, but it still needs attention every time it happens, not just the first time you notice it. Mention it to a doctor even if it only happens for a few days a month.

If you're thinking about ending your life, get help right now, whether or not you're sure PMDD is the cause.

For helpline numbers and dedicated PMDD support resources, see PMDD helplines and support.

If you're thinking about ending your life, get help now. In the US, call or text 988. In the UK, call Samaritans on 116 123. Anywhere else, call your local emergency number or go to the nearest emergency department.