Signs of ADHD in Adults That Get Missed for Years

By Tatiana Carballo, RCC | Tatiana Carballo Therapy, Abbotsford & Virtual across BC

If you've ever read a list of ADHD symptoms and thought, "Well, that's not me, I never bounced off the walls as a kid," this one's for you.

Here's the thing most people don't realize: the picture of ADHD many of us grew up with (a restless boy who can't sit still) is only one version. A lot of adults, especially women, spent years being called "scattered," "too sensitive," or "lazy" when something else was going on. They got good at covering it up, and nobody looked twice.

Let's talk about what actually gets missed.

Why ADHD in adults slips through the cracks

In childhood, ADHD is diagnosed in boys roughly three times as often as in girls. By adulthood, that gap shrinks to close to one-to-one, according to a 2023 systematic review in the Journal of Attention Disorders. In other words, a lot of girls grew up and got diagnosed later, if at all.

A few reasons researchers point to:

• The inattentive type is quieter. Daydreaming, disorganization, and forgetfulness don't disrupt a classroom, so nobody refers a child for assessment.

• Masking is exhausting but effective. Many girls work hard to hide symptoms to avoid social consequences, and that effort can carry into adulthood.

• Other labels get there first. Anxiety and depression are often treated for years while the ADHD underneath goes unnamed.

• Life was propped up. Structure from school, parents, or a predictable job can hold things together until a big life change (a new baby, a promotion, a move) removes the scaffolding.

And for the record, researchers studying adult ADHD have been clear that not having a childhood diagnosis shouldn't stop an adult from being taken seriously.

7 signs of ADHD in adults that often get missed

None of these alone means you have ADHD. But if several feel uncomfortably familiar, it's worth getting curious.

1. Your anxiety or low mood never fully clears up

You've done the breathing exercises. Maybe you've been on medication or in therapy before. It helped a bit, but something keeps dragging you back.

This one is common. A 2025 review in Frontiers in Psychiatry notes that roughly 47% of adults with ADHD also have an anxiety disorder, and depression is common too. Sometimes the anxiety is real and it's being fed by the daily friction of forgotten deadlines, lost keys, and a constant sense of being behind.

2. Your emotions go from zero to a hundred

We usually think of ADHD as an attention problem. But a 2023 systematic review in PLoS One (22 studies) found that emotional dysregulation shows up consistently in adults with ADHD and may deserve to be treated as a core feature, not a side effect. That can look like a short fuse, big frustration over small things, or getting flattened by criticism and then feeling embarrassed about how hard it hit.

3. Time feels slippery

Many adults describe having two settings: "now" and "not now." You're late even when you left early. A deadline two weeks out doesn't feel real until the night before. Then you somehow pull it off in a burst, which only reinforces the pattern.

4. You're "so smart" but things don't match up

You may have heard some version of "you're so capable, why can't you just...?" Research on women diagnosed late describes years of feeling "different" and blaming themselves for underachieving, when the real issue was an unrecognized difference in how their brain handles focus, planning, and follow-through.

5. Your life runs on elaborate systems (or total chaos, with no in-between)

Colour-coded calendars, six alarms, a rigid routine you can't deviate from. Or the opposite: everything piles up until something breaks. Both can be ways of managing ADHD, and both can be exhausting.

6. You're restless on the inside

Adult hyperactivity often looks less like running around and more like a racing mind, a need to always be doing something, or trouble relaxing without feeling guilty. From the outside, you look calm. On the inside, it's a lot.

7. Relationships feel harder than they should

Forgetting things people told you, drifting mid-conversation, losing track of plans. A systematic review of women's experiences with late ADHD diagnosis identified difficult relationships as one of its main themes. Over time it's easy to read this as "I'm a bad friend/partner/parent," when it's more likely a pattern worth understanding.

"Isn't this just anxiety? Or burnout?"

Maybe. Honestly, it can be both, and that's part of why ADHD gets missed. Anxiety, depression, burnout, and trauma can all look like ADHD, and ADHD can look like all of them. That's why a careful assessment matters more than a quiz result.

Who can actually diagnose ADHD in BC?

I want to be upfront: a blog post can't diagnose you, and neither can a TikTok. In Canada, ADHD is assessed and diagnosed by a qualified medical professional, such as a family physician, nurse practitioner, psychiatrist, or psychologist, following guidelines like those from CADDRA (the Canadian ADHD Resource Alliance). A screening tool like the Adult ADHD Self-Report Scale (ASRS) can be a helpful conversation starter to bring to your appointment.

Where counselling fits in

Whether or not you end up with a formal diagnosis, therapy can help you make sense of the patterns, build practical strategies that work with your brain instead of against it, and deal with the years of self-criticism that often come with being missed. Many adults tell me the biggest shift is just no longer assuming they're broken.

Before becoming a therapist, I spent over ten years as a nurse, and I'm trained as an ADHD Clinical Services Provider. I see adults for counselling in person in Abbotsford and virtually across British Columbia.

If any of this sounds like you, you don't need to have it figured out before reaching out. Learn more about working with adults or book a consultation.

This post is for general education and isn't a substitute for a medical assessment or diagnosis.

Sources

• Miss. Diagnosis: A Systematic Review of ADHD in Adult Women. Journal of Attention Disorders, 2023.

• Soler-Gutiérrez, A.-M., Pérez-González, J.-C., & Mayas, J. (2023). Evidence of emotion dysregulation as a core symptom of adult ADHD: A systematic review. PLoS One, 18(1), e0280131.

• Li, Y. (2025). Adult ADHD and comorbid anxiety and depressive disorders: a review of etiology and treatment. Frontiers in Psychiatry.

• Adult diagnosis of ADHD in women: A mixed methods investigation. Journal of Attention Disorders.

• Underdiagnosis of ADHD in women as a hidden hurdle and its consequences for functioning in adulthood: a literature review (2025).

• Agnew-Blais, J. C., et al., as summarized by CHADD: Women often diagnosed with ADHD later in life.

• CADDRA: Canadian ADHD Practice Guidelines, 4.1 Edition (2020).