ADHD in Adolescence: What's Different for Girls and Boys in Middle and High School

Why the same diagnosis can look so different — and what parents, educators, and teens need to know about gender, puberty, and getting the right support. 

If you have been following along with our blog, you already know that ADHD is so much more than a child who cannot sit still. Today I want to talk about something that does not get nearly enough attention: how ADHD shows up very differently depending on gender, especially once kids hit the middle and high school years. Whether you are a parent, a teacher, or a teenager trying to make sense of your own brain, I hope this gives you some language and clarity that feels helpful.

If you’ve been following along, you may already know that girls with ADHD are significantly underdiagnosed compared to boys. The reason is not that girls have it less, it is that they tend to show it differently. And because most of our early diagnostic research was conducted almost entirely on boys, the mental image many people have of ADHD simply does not match what it looks like in a lot of girls.

Middle school (ages 11–14): when the differences start to show

Middle school is already a lot. New school, new social dynamics, harder academics. For kids with ADHD, all of that gets turned up a notch. But boys and girls often experience this very differently.

For boys with ADHD in middle school, the signs are often hard to miss. Research shows that boys with ADHD tend to present with more externalizing behaviors such as things like physical restlessness, impulsivity, rule-breaking, and trouble sitting still in class (sometimes this may be misrepresentated as ODD but that’s a conversation for another time). These behaviors draw attention, which means boys are more likely to be referred for evaluation and ultimately receive a diagnosis and support earlier in life.

Girls in middle school

• Daydreaming, seeming "spacey"

• Disorganized but tries to compensate

• Emotional sensitivity, anxiety

• Hyper-talkativeness with friends

• Internalizes struggles, hides them

• Often labeled as "shy" or "anxious"

Boys in middle school

• Restlessness, fidgeting, out of seat

• Impulsive outbursts, blurting answers

• Rule-breaking, defiance

• More visible academic struggles

• Referred for evaluation more often

• Conduct or ODD co-occurrences

For girls, the picture looks different. Research consistently finds that girls with ADHD are more likely to present with inattentive symptoms: they struggle with organization and focus, but they are not disrupting the classroom. Instead, they are daydreaming at their desks, losing track of assignments, or feeling quietly overwhelmed. Because these behaviors are less disruptive, they are far less likely to result in a referral for evaluation.

A note on masking: Research indicates that girls with ADHD develop masking strategies — consciously or unconsciously hiding symptoms to appear organized and capable — far more often than boys. By the time a girl reaches middle school, she may already have years of practice covering up how hard she is working just to keep up. This is exhausting, and it delays diagnosis.

Another key difference at this age is how co-occurring conditions present. Boys with ADHD more commonly show externalizing comorbidities like oppositional defiant disorder or conduct problems. Girls, on the other hand, are more likely to develop anxiety and depression alongside their ADHD and because those conditions show up first, they are often treated for anxiety or depression while the underlying ADHD goes unaddressed.

High school (ages 14–18): puberty changes everything

If middle school was where the differences started to surface, high school is where they can really intensify and a big reason for that is puberty. Hormonal changes affect everyone with ADHD, but the experience is notably different for girls versus boys.

For boys, increases in testosterone during puberty are linked to heightened risk-taking behavior and impulsivity. Research suggests that boys with ADHD may be especially vulnerable to the risk-enhancing effects of pubertal testosterone, which may help explain why this age group shows elevated rates of substance use, conflict with authority, and peer pressure challenges. It is not that boys are bad but their brains are being flooded with hormones that amplify patterns that were already there.

For girls, the hormonal story is different. Estrogen plays a direct role in stimulating the prefrontal cortex which is the part of the brain responsible for focus, decision-making, and impulse control. When estrogen fluctuates (which it does significantly during puberty and throughout the menstrual cycle), girls with ADHD often experience worsening inattention, mood dysregulation, and emotional reactivity. These shifts can be dramatic enough that a girl who was managing reasonably well in middle school may suddenly appear to be "falling apart" in ninth or tenth grade. This is not because anything new is wrong, but because her brain is responding to hormonal changes.

This is one of the most important things I want parents and educators to understand: a girl whose ADHD symptoms seem to get worse in high school is not “making it up” nor is she “just developing ADHD”. Her body is changing and therefore the symptoms of ADHD are changing. 

Social and emotional stakes in high school

By high school, the social and emotional toll of undiagnosed or undertreated ADHD becomes even more significant. The experience differs by gender.

Boys with ADHD in high school often continue to struggle with impulse control, which can affect friendships, romantic relationships, and interactions with teachers and authority figures. The combination of social struggles, low self-esteem, and peer pressure places them at higher risk for substance use. Research confirms that teens with ADHD who have faced years of social difficulty may gravitate toward peer groups that further compound those risks.

For girls, the emotional and social stakes tend to manifest inward. Studies show that girls with ADHD have lower self-efficacy which means they believe less in their ability to succeed and use poorer coping strategies compared to their male counterparts. Perhaps most alarming is research linking undiagnosed ADHD in girls with significantly increased rates of depression, anxiety, and in more serious cases, self-injurious behavior and suicidal ideation. These are not small statistics. They are a direct consequence of years of struggling without the right support.

Girls in high school

• Worsening symptoms tied to menstrual cycle

• Higher rates of anxiety and depression

• Low self-esteem, self-doubt

• Risk of self-harm if undiagnosed

• Academic struggles emerging more clearly

• Emotional dysregulation, social withdrawal

Boys in high school

• Testosterone amplifies impulsivity

• Higher risk of substance use

• Conflicts with authority increase

• Mood disorders and conduct problems

• Social isolation if struggles persist

• Medication resistance (wanting to "fit in")

What this means for diagnosis and support

One of the most important takeaways here is that academic success should not rule out an ADHD diagnosis, especially in girls. Many girls with ADHD maintain decent grades through sheer effort and masking, but at a tremendous internal cost. By the time the academic demands of high school (or college) exceed their ability to compensate, they have often spent years feeling like something is wrong with them personally, rather than understanding it as a neurological difference.

Comprehensive evaluations matter enormously here. A good assessment should include self-report measures alongside parent and teacher input  because for girls especially, internalizing symptoms may not show up in a classroom observation alone. Taking the time to truly know your client, understanding their history, and listening to their experience is what makes the difference between a diagnosis that helps and one that misses the mark entirely.

Both boys and girls with ADHD deserve support that is tailored to how their brain works, not to a one-size-fits-all profile built decades ago on a population that did not reflect them. As clinicians, educators, and parents, our job is to stay curious, stay informed, and keep asking questions.

As always, if you have questions, thoughts, or want to talk about getting an evaluation or putting supports in place, please do not hesitate to reach out. I would love to hear from you.

Peer-reviewed references

Biederman, J. et al. (2002). Influence of gender on attention deficit hyperactivity disorder in children referred to a psychiatric clinic. American Journal of Psychiatry.

Chronis-Tuscano, A. (2022). ADHD in girls and women: a call to action. Journal of Child Psychology and Psychiatry.

Dimitri et al. (2025). Sex differences in children and adolescents with ADHD: a literature review. Frontiers in Child and Adolescent Psychiatry.

Hinshaw, S.P. et al. (2021). ADHD in girls and women: underrepresentation, longitudinal processes, and key directions. Journal of Child Psychology and Psychiatry.

Morley & Tyrrell (2023). Exploring female students' experiences of ADHD. Journal of Attention Disorders.

Quinn, P. & Madhoo, M. (2014). A review of ADHD in women and girls: uncovering this hidden diagnosis. The Primary Care Companion for CNS Disorders.

Roberts et al. (2018). Estrogen fluctuations and ADHD symptom severity in young adult females. Neuropsychology.

Solberg et al. (2018). Psychiatric comorbidities in females with ADHD. Journal of Attention Disorders.

Stickley et al. (2020). Gender differences in ADHD. PubMed / Psychiatric Clinics of North America.

Skogli et al. (2013). ADHD in girls and boys — gender differences in co-existing symptoms and executive function. BMC Psychiatry.