Mood swings during perimenopause are one of the symptoms women find most frustrating. While some women feel snappier over minor things, others are suddenly filled with tears despite having a great day. Maybe you experience sudden rage disproportionate to the situation, only to be fine twenty minutes later. But a friend reports feeling “flat” or as though their emotions have been put on mute.

If this sounds familiar, you aren’t alone. And it doesn’t mean you are losing your mind, developing a personality disorder, or failing at emotional maturity. You are experiencing what happens when the hormones that quietly help regulate your emotions for decades begin to shift. As this happens, your brain is working hard to adapt to a changing hormonal environment.

In this article, we’ll explore why women experience mood swings during perimenopause and menopause, and what is happening inside the brain to cause these changes. Although understanding why this happens doesn’t fix it overnight, it can help change how you think about your experience and how you navigate the emotional changes during this transition.

How Your Brain Regulates Emotions

To understand why emotional regulation becomes more difficult during this transition, it helps to understand how it was working before perimenopause.

Two key parts of the brain play an important role in how you experience and regulate emotions:

The amygdala sits deep within the brain and serves as its threat-detection center. It constantly scans your environment for potential danger and initiates rapid emotional responses before conscious processing has fully occurred. Although fast and reactive, its primary job is to keep you safe.

The prefrontal cortex, the region behind your forehead, is your regulating system. It receives the amygdala’s alarm signals and applies context, perspective, and judgment. It’s the part of you that says “this isn’t as bad as it feels” or “let it go, it’s not worth it.” It slows down the amygdala and allows you to determine if something is a threat and what to do. Think of the prefrontal cortex as the brain’s “braking system.” During perimenopause, the brakes still work, but they aren’t quite as responsive as they once were.

These two systems work together to have healthy emotional regulation. When the amygdala raises the alarm, the prefrontal cortex allows you to determine how to respond. When these systems work together well, you feel things appropriately, but you’re not hijacked by them.

Why Do Some Women Seem Completely Fine But I’m Miserable?

Even though there are changes happening with communication between the amygdala and the prefrontal cortex, not all women experience significant emotional variability. The severity of symptoms is based on a variety of factors including genetics, a history of anxiety or depression, sleep quality, life stress, and overall health. Some of these are more controllable, while others aren’t. Understanding why these emotional changes occur can help you respond with greater self-compassion and make it easier to choose strategies that support your brain during this transition.

So What Changes During Perimenopause?

The answer begins with two hormones: estrogen and progesterone. These hormones play an important role in how the amygdala and prefrontal cortex communicate with one another. As hormone levels decline, that communication can become less efficient.

How Estrogen Helps Regulate Mood

Let’s look at the first hormone involved in this system – estrogen. Estrogen influences far more than reproductive health. It also plays an important role in how the brain regulates mood, stress, and emotions. Estrogen supports emotional regulation in several important ways:

• Supports serotonin: Serotonin is a neurotransmitter closely linked to emotional stability, resilience, and overall mood. Estrogen helps the brain produce serotonin and use it more effectively. As estrogen declines during perimenopause, serotonin signaling can become less efficient. For some women, this contributes to sadness, irritability, or emotional ups and downs that can resemble depression—even if they’ve never experienced depression before.
• Calms the amygdala: Research shows that estrogen can calm the amygdala’s reactivity. It reduces the intensity of threat responses, making the emotional alarm system less hair-trigger. As estrogen declines, the amygdala can become more reactive. The same event that once produced a mild irritation can now produce a disproportionate spike of anger or anxiety. This isn’t simply an overreaction, it’s what happens when the brain’s normal emotional “braking system” isn’t working as efficiently.
• Supports dopamine: Dopamine governs motivation, reward, and the sense that effort is worthwhile. As estrogen falls, dopamine signaling can become less efficient. The result for women can be a flattening of motivation, diminished pleasure in things that previously brought joy, and a sense of going through the motions. These symptoms overlap significantly with depression but have a distinct hormonal driver.
• Reduces inflammation: Estrogen also helps keep the brain’s immune system balanced. One way it does this is by reducing inflammation in the brain, which researchers increasingly recognize as playing a role in mood disorders.

In short, estrogen isn’t just a reproductive hormone, it also helps keep the brain’s emotional regulation systems running smoothly.

Progesterone’s Role In Mood

Progesterone plays a different, but equally important, role. Progesterone is often called the “calming hormone” and for good reason.

When progesterone is broken down in the brain, it forms a compound called allopregnanolone, which acts directly on GABA receptors. GABA is one of the brain’s primary calming chemical messengers. It helps slow brain activity, reduce anxiety, and promote relaxation. Allopregnanolone is so effective at this that it forms the basis of an FDA-approved medication for postpartum depression.

As progesterone declines during perimenopause and menopause, so does allopregnanolone. The brain loses a key source of its natural anxiety buffer. The nervous system can become more excitable, more reactive, and harder to settle. Things that once rolled off now land differently. Anxiety that was previously mild becomes harder to dismiss. The baseline hum of calm that you may never have noticed (because it was always there running in the background) is quieter now, or sometimes absent.

Without progesterone’s calming influence, everyday stress can simply feel bigger than it used to.

Why Stress Feels Bigger During Perimenopause and Menopause

Layered on top of the estrogen and progesterone changes is a shift in how the body handles the primary stress hormone, cortisol.

Even modest, chronically elevated cortisol levels, which can be common during perimenopause, can make it harder for the nervous system to recover after stress. The small stressors that once would have been dealt with and forgotten can now trigger responses that feel more appropriate for genuine emergencies.

This is why menopausal women often describe feeling overwhelmed by things that, rationally, they know aren’t overwhelming.

The emotional response isn’t irrational. It’s physiologically amplified. During perimenopause and menopause, the stress-response system can become more sensitive, leaving your nervous system in a more activated state. It’s almost as though someone quietly turned up the volume knob on your stress response and you didn’t even notice it happening. If you’ve ever wondered, “Why am I suddenly anxious about something that normally wouldn’t bother me?” this is one reason why.

Sleep deprivation, which is quite common during perimenopause, compounds this further. Even mild sleep loss can significantly impair prefrontal cortex function, reduce emotional resilience, and increase amygdala reactivity. You are trying to regulate your emotions with a brain that is simultaneously losing its hormonal scaffolding and running on insufficient sleep. The difficulty isn’t a character flaw. It’s the perfect storm.

The encouraging news is that understanding what’s happening allows you to choose strategies that calm the nervous system rather than simply trying to “push through.”

Why It Can Feel Like a Loss of Self

One of the most distressing aspects of emotional dysregulation during perimenopause is not feeling like yourself. Maybe you were a patient person, a calm person or a person who didn’t cry easily. Maybe you handled conflict well, or you prided yourself on emotional steadiness. Or maybe you were a bit reactive, but you were able to manage and thrive. Now that person seems to have been replaced by someone you don’t entirely recognize.

As unsettling as this can feel, it helps to think of this period as a transition rather than a transformation. Your life experiences, values, and coping skills are still part of who you are and remain some of your greatest strengths. Hormonal changes may affect how your brain responds to stress, but they don’t change the person you’ve always been. It simply means your brain has to work harder right now.

Many women find this transition becomes easier when they stop fighting the changes and begin working with them. Building new supports for emotional regulation often leads to better long-term resilience.

There Is Hope

Mood swings during perimenopause can feel overwhelming, but they don’t last forever. Understanding what’s happening inside your brain is the first step toward finding strategies that help you feel more like yourself again.

In our next blog, we’ll explore practical, evidence-based strategies that can help improve emotional regulation during perimenopause and menopause. The encouraging news is that the brain remains adaptable throughout life. Whether through healthy lifestyle changes, therapy, hormone therapy when appropriate, or neurofeedback, there are effective ways to support emotional regulation during this transition.

If emotional changes are interfering with your relationships, work, or daily life, you don’t have to navigate them alone. Northwest Neurofeedback offers evidence-informed neurofeedback and personalized care for women navigating perimenopause and menopause. Or you can visit our website to learn more about our services.

Additional resources:

• The Menopause Society
• National Menopause Foundation

This article is for informational purposes only. If you are experiencing significant mood changes, anxiety, or depression during menopause, please speak with a qualified healthcare provider. You don’t have to navigate this alone.