Which are the causes of Premenstrual Dysphoric Disorder?

The exact cause of Premenstrual Dysphoric Disorder (PMDD) is not fully understood, but it is currently recognized as an abnormal, heightened sensitivity to the normal hormonal fluctuations of the menstrual cycle in the brain.

The Biological Mechanism

Think of the brain as a complex electrical grid. In individuals with Premenstrual Dysphoric Disorder, the brain’s neurotransmitters—specifically serotonin—react in an exaggerated way to the natural rise and fall of estrogen and progesterone. While most people experience minor mood shifts during these cycles, those with Premenstrual Dysphoric Disorder experience a "short circuit" in their emotional processing centers, leading to the severe depressive and anxious symptoms characteristic of the condition.

Genetic and Environmental Factors

Research indicates that Premenstrual Dysphoric Disorder has a significant genetic component, with studies suggesting that the disorder is heritable; however, no single "PMDD gene" has been identified. Instead, it is likely a polygenic condition, meaning multiple genes interact to create vulnerability. Environmental factors, such as a history of childhood trauma or chronic stress, are considered significant risk factors that may "prime" the nervous system to be more reactive to hormonal changes, potentially triggering the onset of Premenstrual Dysphoric Disorder.

Distinguishing Causes from Risk Factors

It is important to distinguish between a cause and a risk factor. A cause is the direct mechanism—in this case, the aberrant response to hormonal metabolites (like allopregnanolone) in the brain. A risk factor, such as a family history or prior life stress, merely increases the likelihood that an individual will develop the condition. Current research is focusing on the role of the endocrine system and the HPA axis (the body’s stress response system) to determine why this sensitivity occurs in some people and not others.

Medical Disclaimer: This information is for educational purposes and does not constitute medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD)


• National Institute of Mental Health (NIMH) - Premenstrual Dysphoric Disorder


• International Association for Premenstrual Disorders (IAPMD)