It’s Just PMS...or is it? The Difference Between PMS, PMDD & PME Matters

8/9/2026 by Dr. Rachel Dillinger, MD PMH-C, integrative and reproductive psychiatrist

A person stares at a calendar with an apprehensive expression on their face, as the calendar has the luteal phase marked with sad faces due to PMS, PMDD, or PME

If you have a uterus, the chances are good that at some point in life, your mental health will dip before your period.

While many people assume (or are told) that it’s “just PMS,” this is not always true. I don’t like to argue semantics when it doesn’t change the outcome or plan of attack. This does.

All three conditions outlined below typically start 1-2 weeks before menstruation, and get better within the first couple days of bleeding.

Premenstrual syndrome (PMS) is the most common diagnosis of the three. Around 20-30% of those with PMS experience these symptoms to a “moderate to severe” degree:

  • mild mood swings and irritability
  • breast tenderness and swelling
  • cravings for particular foods
  • sleep changes
  • headaches
  • bloating
  • fatigue

Premenstrual Dysphoric Disorder (PMDD) is estimated to affect 5-10% of people with a uterus. As with other things labeled as a “disorder,” it requires functionally impacting someone’s day-to-day life and/or relationships. In other words, while the following symptoms universally suck, it they aren’t impairing you, they wouldn’t technically qualify you as having PMDD:

  • Extreme sadness, hopelessness, or thoughts of not being around anymore (calling or texting 988 is a fast way to get compassionate help if you are experiencing suicidal ideation)
  • Marked irritability, anger, rage, or conflicts with others (even if you recognize the issue isn’t something you *should* be that upset about)
  • Feeling overwhelmed or a sense of being out of control
  • Loss of interest in the things you normally enjoy day-to-day
  • Intense anxiety, tension, or panic

Premenstrual exacerbation (PME) is the entity we honestly understand the least. Symptoms get better, but don’t go away entirely, with menstruation, which helps differentiate it from the other two.There are studies that estimate its prevalence (around 50% of those with underlying depression, bipolar disorder, anxiety, ADHD, or other psychiatric conditions), but treatment and underlying drivers are only beginning to be understood and are currently in the theoretical stage.

We as a scientific community recognize the phenomenon exists, have identified potential reasons for individual conditions, but have yet to demonstrate on a large scale the definitive reasoning.

Hormonal shifts are a unifying premise, of course, and we do know that for bipolar disorder, symptoms are cyclic and mellow out for many post-menopause. Similarly, we recognize that for things like Mast Cell Activation Syndrome (MCAS), flares during the times estradiol is the highest (around ovulation and peak luteal phase) and when progesterone acutely plumets (the few days to prior to menstruation) are common. Estradiol also increases the amount of dopamine our brain releases and the number of dopamine receptors that are expressed in the brain, so ADHD symptoms flaring prior to menstruation has a plausible explanation there, too.

Why should you care which you have? It changes the treatment.

For PMS, allowing time for extra sleep, consuming phytoestrogens in the luteal phase, and gentle exercise can be enough to bring relief.

For PMDD, supplements like chaste berry, swedish flower pollen extract, and B6 can make an impact, as do the mainstays of treatment like selective serotonin reuptake inhibitors (SSRIs) and oral contraceptive pills (especially those containing drospirenone).   

For PME, increasing the intensity of whatever treatment you’ve chosen to utilize for the underlying disorder is often the recommendation. This might mean a higher dose of an SSRI or lithium during the luteal phase, an additional as needed immediate release stimulant or slightly higher dose, or even consideration for skipping cycles (this is sometimes a strategy for PMDD as well).

There are a lot of factors and it’s always my recommendation to work with your doctor to come up with the best plan for you. And if you’re curious as to why PMDD is even a thing and have three minutes to spare, check out my take on the evolutionary role it may play on my channel here.

This post and the contents of this blog are for educational purposes only and are not intended as medical advice. Please discuss any questions with your personal medical team. If you would like Dr. Dillinger to be a part of that team, request an appointment here.

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