Is It ADHD or Perimenopause? A Symptom Comparison Guide for Women in Their 30’s and 40s

You forget where you parked the car. You read the same paragraph four times and still can't tell anyone what it said. Your husband asks what's for dinner and the question feels like a maths problem. You feel weepy, then snappy, then absolutely fine, then weepy again, all before lunch. And somewhere underneath all of it is the dawning suspicion that something has changed, that the version of you who used to keep ten plates spinning is not coming back to the phone today.

If you've found yourself googling "is it ADHD or perimenopause" at 2am, you are in very good company. It is one of the most asked questions on women's health forums, in coaching practices, and in the search bars of Australian women in their late thirties and forties. And it is one of the hardest questions to answer cleanly, because the symptoms overlap to an almost cruel degree.

I'm Ash, a Certified NLP Practitioner and ADHD strategist working with late diagnosed women across Australia, online via Zoom. Most of the women I work with have been quietly googling "why am I like this" at midnight for years. Some have a formal diagnosis. Some are still figuring it out. Most were doing fine… until perimenopause arrived and turned the volume right up. This guide will not diagnose you. Only a doctor can do that. But it will give you the clearest comparison I've been able to put together, with the Australian context built in, so you can walk into your next GP appointment with a much better idea of what you're actually asking about.

The short answer: it's often both

Here is the part the internet usually buries. ADHD and perimenopause are not opposites that you have to choose between. They are two conditions that can absolutely co-exist, and when they do, they amplify each other in ways that can feel completely overwhelming.

Research published in 2025 found that women with ADHD score significantly higher on perimenopausal symptom scales than women without, with severe perimenopausal symptoms affecting 54.2% of women with ADHD compared to 30.1% without. The same body of research suggests that perimenopause may begin up to ten years earlier in women with ADHD, with symptom severity peaking between the ages of 35 and 39.

What this means in practice: if you've quietly suspected ADHD for years but always managed to mask it, perimenopause is often the moment the mask slips. The hormonal shifts unmask traits that structure, sheer effort, and a tightly held morning routine used to keep in check. Many women in Australia receive their very first ADHD diagnosis in their forties, and they are not imagining the connection.

Side-by-side: how the symptoms overlap

Before we get into the differences, let's lay out the sameness, because that is what makes this question so confusing in the first place.

Look at this list and notice how many entries could plausibly belong to either column. Both ADHD and perimenopause can cause: difficulty focusing, brain fog, forgetfulness, mood swings, irritability, anxiety, low motivation, sleep disturbance, fatigue, emotional reactivity, low self-esteem, and a pervasive sense of "I should be able to handle this."

If you've read women's health articles that listed "trouble concentrating" as a perimenopause symptom and then ADHD articles that listed the same symptom under ADHD, you are not losing your mind. You are reading two accurate descriptions of conditions that share enormous symptom territory.

The seven big overlaps, broken down

Here is where the comparison gets useful, when you take each shared symptom and look at what subtly differentiates the ADHD version from the perimenopause version. The differences are real, but they are about pattern, timing, and history, not about the symptoms themselves.

1. Brain fog and inattention

Perimenopause brain fog typically appears suddenly, somewhere in your late thirties or forties, in someone who was previously quite sharp. It tends to come and go in cycles tied to your menstrual cycle and worsens around your period. It often improves with sleep, with hydration, and, for some women, with hormone therapy.

ADHD inattention, by contrast, has been there your whole life, even if no one named it. As a child you may have been called daydreamy, scatterbrained, or "so smart but doesn't apply herself." The fog is not new. What is new in perimenopause is the volume. The same inattention you've spent thirty years working around suddenly costs you twice as much energy to compensate for.

The cleanest tell: if you can remember being like this in your twenties, losing your keys, missing deadlines, drifting off in lectures, but always finding a way to power through, what you're feeling now is probably both. ADHD that was quietly there, and perimenopause that has cranked the dial.

2. Mood swings and emotional dysregulation

Perimenopausal mood changes track the cycle. Many women describe a darkening in the week before their period that didn't used to feel this severe. The mood shifts are real, often hormonal, and frequently respond to lifestyle changes, exercise, magnesium, or, under medical supervision, hormone therapy.

ADHD emotional dysregulation runs on a different rhythm. It is reactive: a cancelled plan, a critical comment, a piece of feedback at work, and your nervous system spikes in seconds. Therapists call this rejection sensitive dysphoria, and it is one of the least-talked-about parts of ADHD in women. The intensity of the emotion is wildly disproportionate to the trigger, and it usually resolves quickly once the trigger has passed.

If your mood feels like a hormonal weather system, look at perimenopause first. If it feels like every text message has the power to ruin your afternoon, look at ADHD too.

3. Sleep problems

Perimenopausal sleep issues are typically the staying asleep kind. You fall asleep fine, then wake at 2 or 3am, sometimes drenched in sweat, sometimes wide awake with a racing mind. Hot flushes, night sweats, and shifting progesterone levels are usually behind it.

ADHD sleep issues are usually the falling asleep kind. The brain refuses to wind down. You lie there with thoughts cycling through the day, the next day, that thing you said in 2014, the documentary you want to watch. Many women with ADHD describe themselves as night owls who never wanted to sleep at the same time as the rest of the household.

If you struggle most at the start of the night, ADHD is in the mix. If you wake up at 3am and the room feels like a sauna, perimenopause is in the mix. If both are true, both are likely in the mix.

4. Forgetfulness

Perimenopausal forgetfulness tends to focus on word recall. You walk into a room and forget why. You can't think of the word for "colander." You start a sentence and lose the thread. It can feel deeply alarming, particularly if your mother or grandmother had dementia, but it is almost always benign and almost always tied to fluctuating estrogen.

ADHD forgetfulness has a very different flavour. It is about working memory: the inability to hold information in your mind long enough to use it. You can't remember whether you took the supplement, whether you replied to the email, whether you put the wash on. You may have spent your whole life relying on systems, lists, and post its because of this.

If your forgetting feels like words slipping through your fingers, perimenopause is likely. If your forgetting is about tasks evaporating the moment you turn around, ADHD is the older friend in the room.

5. Fatigue and burnout

Perimenopausal fatigue is bone deep. It is the kind of tiredness that no amount of sleep seems to fix. It often comes with shifts in body composition, achiness, and a sense of physical heaviness.

ADHD burnout is more about the cost of masking. After years, sometimes decades, of holding it together by sheer willpower, the system runs out of fuel. Often this happens at exactly the same time as kids becoming more independent, careers reaching a senior level that requires more executive function, and parents needing more support. Burnout is the bill arriving.

When the two combine, perimenopausal exhaustion plus ADHD burnout, the result is what many of the women I work with describe as "hitting a wall I can't climb." Recognising both layers is the first step in dismantling them.

6. Sensory sensitivity

Perimenopause can bring a new intolerance for noise, heat, certain fabrics, and stimulation, particularly during high symptom weeks. For some women this is a brand new experience.

ADHD sensory sensitivity has, again, usually been a lifelong feature. The label on the t-shirt. The sound of someone chewing. The fluorescent lights. What changes in perimenopause is your bandwidth. The sensory input you used to tolerate now lands in a system with fewer reserves.

If you suddenly cannot bear the sound of the dishwasher, look at both.

7. Anxiety

Perimenopausal anxiety often shows up as a low grade dread, a tightness in the chest, or an unfamiliar sense of being on edge. It tracks the cycle and frequently improves with hormonal intervention.

ADHD anxiety has a particular flavour: it is anxiety about not coping. Anxiety about forgetting. Anxiety about being late. Anxiety about being found out. It is anxiety born from years of running a brain on hard mode and not knowing why everything took so much effort.

Both deserve attention. Both are treatable. Neither is something you should be expected to power through alone.

How to tell them apart in three questions

If you only have ten minutes with your GP, three questions will get you a long way toward an answer.

First: is what you're experiencing new, or new in intensity? Truly new symptoms in your forties point toward perimenopause. Old symptoms with the volume turned up point toward ADHD that's been unmasked.

Second: does it cycle? Symptoms that worsen the week before your period, then ease up, are heavily hormonal. Symptoms that are roughly constant, with bad days and good days but no monthly pattern, are more likely ADHD coloured.

Third: did anyone notice any of this when you were a child? Were you the dreamy one in class, the disorganised one, the one who lost lunchboxes and had "could do better" written on every report card? Childhood traits are the strongest signal that ADHD has been there all along.

What to do next, if you're in Australia

Start with your GP. Ask for a long appointment so you have time to talk through both possibilities. Bring a written list of the symptoms you want to discuss, your working memory does not need to be doing the heavy lifting here.

For perimenopause, your GP can order hormone panels, talk you through whether HRT might be appropriate, and refer you to a women's health specialist if needed. WellFemme is Australia's first dedicated telehealth menopause clinic and is a useful option if local appointments are hard to come by.

For ADHD, the path is changing fast. As of 2026, both NSW and Victoria have announced reforms to allow trained GPs to diagnose and treat ADHD in adults, a major shift from the previous psychiatrist only model. Outside those states, the path still typically runs GP referral to psychiatrist, with current wait times around 12 months and out of pocket costs near $1,400 for an assessment. Knowing the system before you start saves heartbreak.

Why this matters more than just "figuring it out"

Diagnosis is not the end of the story. It is, in many ways, the beginning. But knowing what you're working with changes everything.

If it's perimenopause, you can stop blaming yourself for not being as sharp as you were and start treating the body that's actually in the room. If it's ADHD, you can stop interpreting thirty years of struggle as moral failure. If it's both, and for many of the women I work with, it is, you can finally build a life that works with your brain and your body, rather than against them.

The women I see who do best are not the ones who get every answer first. They are the ones who get curious, ask better questions, and assemble a small team, GP, sometimes psychiatrist, sometimes coach, sometimes therapist, who actually understand the overlap.

Your next step

If this article landed somewhere in your chest, that is data worth following gal.

Three ways to keep going.

Free: download the ADHD & Perimenopause Doctor Prep Pack in the store. It's the workbook I built for the woman walking into her GP appointment trying to remember why she went. It gives you a structured way to capture the symptoms you're noticing.

Self paced: the How My Brain Ticks workbook walks you through over 30 ADHD traits with reflection prompts and strategies that actually fit late diagnosed brains. $69.95 on its own, or free inside the $250 ADHD Breakthrough Box (which also includes tools, rituals, and sensory supports).

With me directly: apply for 1:1 coaching from the homepage. Six sessions over six weeks, trait by trait, on Zoom. I take a small number of women at a time so each one gets full attention.

Whatever you choose, please don't keep doing this alone in front of a glowing phone at 2am. The answers are findable, and they are kinder than the ones your brain has been offering.