A lot of the women I work with have spent years — sometimes decades — being told they're too emotional, too reactive, too sensitive. Some arrive with a Borderline Personality Disorder (BPD) diagnosis already in hand. Others arrive wondering why nothing has ever quite fit.
I've been sitting with this question for a while now. When I was doing a Dialectical Behaviour Therapy (DBT) training — a treatment developed specifically for BPD — I kept finding myself stopping and going back over the material. Not because it was unclear, but because so much of it felt uncomfortably familiar. The emotional dysregulation, the rejection sensitivity, the impulsivity. I knew these features. I'd seen them in my clients. And quietly, in the back of my mind, I was also recognising them in myself — at a point when I was still working through my own late Attention Deficit Hyperactivity Disorder (ADHD) diagnosis.
It made me wonder how many times I'd been looking at the wrong map.
Why the Confusion Happens
On paper, the two conditions share a lot of ground. Emotional dysregulation. Impulsivity. Unstable relationships. Rejection sensitivity. Chronic restlessness. When a woman presents with these features, BPD often gets there first — especially if she's expressive, has a difficult history, or presents in distress.
ADHD gets overlooked for a few reasons. She's articulate. She's holding it together. She doesn't seem hyperactive. And critically — most ADHD assessment tools were built using data from men and boys, which means women are routinely measured against a standard that was never designed for them.
This is part of what makes late diagnosis so disorienting. When you finally start to understand your own neurology, you also have to reckon with all the years you spent interpreting yourself through frameworks that didn't quite fit — or worse, through ones that fit just enough to be convincing.
ADHD has a way of hiding underneath whatever the loudest, most obvious presentation is. If BPD is on the table, ADHD often doesn't even get a seat.
Women with ADHD also tend to internalise. Where a boy might be disruptive, a girl is more likely to be quietly overwhelmed. By adulthood, many have developed sophisticated masking strategies — functional on the outside, exhausted on the inside. They often collect anxiety or depression diagnoses for years before anyone thinks to look for ADHD.
What Good Assessment Actually Looks Like
One of the biggest problems in getting this right is that no single test or questionnaire tells the whole story. Current evidence supports pulling from three different sources — and missing any one of them increases the chance of getting it wrong.
The first is a structured questionnaire. The most widely recommended adult screener in Australia is the ASRS — a self-report checklist developed with the World Health Organisation that asks about attention, impulsivity and everyday functioning. It has the highest sensitivity and specificity of any adult tool currently available, and it's what most psychiatrists here expect to see as part of a formal assessment. It's a starting point, not a finish line — but it's a strong one.
The second is a detailed clinical interview. This is where the real picture starts to form. A good ADHD interview doesn't just ask about right now — it goes back through childhood, school, relationships, work history. ADHD has to have been present since before age twelve, so that developmental thread matters. The gold standard interview used in Australia works through every symptom criterion with concrete real-life examples, helping people recognise themselves in the questions rather than second-guess their answers.
The third is collateral information — input from someone who knows the person well. A partner, parent, sibling, close friend. For women who have spent years appearing more capable than they feel, an outside perspective can surface things that self-report alone misses. It's one of the most underused parts of the process.
When BPD is also being considered — and in complex presentations, it often should be — the assessment needs to go further. There are structured interviews and validated questionnaires designed specifically to assess personality disorders, and these sit alongside the ADHD tools rather than replacing them. Emotional dysregulation also needs to be measured directly across both conditions — not just noted as present, but quantified in terms of severity and how it shows up day to day. This is one of the most clinically useful pieces of information available, and one of the most commonly skipped.
The Hormonal Piece That Still Gets Missed
For women with ADHD, symptoms don't stay constant across the month. They fluctuate with the menstrual cycle — driven by the way oestrogen interacts with the brain chemicals involved in attention and impulse control. Many women describe being relatively functional for part of the month and completely undone at others. That pattern often gets labelled as mood instability rather than what it actually is.
A severe form of premenstrual syndrome called Premenstrual Dysphoric Disorder (PMDD) — which involves significant mood disruption in the lead-up to a period — occurs at much higher rates in women with ADHD than in the general population. Asking about the menstrual cycle should be a routine part of any ADHD assessment for women. It often isn't.
Why This Matters
Getting the diagnosis right changes everything — not just the treatment pathway, but how a person understands themselves. There's a particular kind of relief that comes from finally having a framework that actually fits. From realising that the chaos, the exhaustion, the shame around never quite keeping up — it wasn't a character flaw. It was something else entirely, something that can be named and worked with.
I think about the women who sat across from clinicians — good clinicians, well-meaning clinicians — and walked out with the wrong answer. Not because anyone was negligent, but because the loudest symptoms pointed somewhere, and ADHD was quietly underneath, waiting. That's not a small thing. The story you're given about yourself shapes everything that follows.
For women who have been misdiagnosed or dismissed: your experience is valid data. The way you've moved through the world, the patterns you've noticed in yourself, the things that have always felt a bit off — all of it matters clinically. A thorough, gender-informed assessment can make an enormous difference, and the evidence is finally starting to catch up.
For clinicians: the tools exist. The framework is there. Ask about hormones, measure emotional dysregulation properly, and don't let the loudest diagnosis in the room drown out the quieter one underneath.
