It's Not Just Hyperactivity: How ADHD Shows Up in Adults
Most people picture an energetic boy who can’t sit still, who runs instead of walking, and who inappropriately disrupts class when we talk about ADHD. That’s not always inaccurate, but it’s not the full story. It’s also why many adults were never diagnosed until adulthood.
As I mentioned in my first ADHD Awareness Month post, over half of U.S. adults with ADHD received their diagnosis as adults rather than as children (Centers for Disease Control and Prevention, 2024). That was surely the case for me. This means many people lived for years thinking they were just strange or ill-equipped because everything seemed so much harder than for everyone else. ADHD doesn’t end at age 18. For many people, it persists into adulthood but presents differently.
As children get older, attention problems tend to persist, while hyperactivity and impulsivity are more likely to subside (National Institute of Mental Health). In adults, hyperactivity may manifest as severe restlessness, such as fidgeting rather than running and climbing, or as a restless mind (American Psychiatric Association, 2025). In short, a child who has trouble sitting still may grow up to be an adult who has difficulty sitting still mentally and has urges to fiddle with their fingers or a pen. Common presentations of ADHD in adults are described below. This is not a diagnostic tool. Anyone can experience the circumstances listed below. However, in relation to ADHD, symptoms are consistent, frequent, long-lasting, and usually interfere with daily life, leading to varying degrees of distress.
Difficulty focusing: You begin a task and within a few minutes, your attention shifts to three other things. You keep rereading the same sentence in an email. Or you focus so intensely on one thing you’re interested in that hours fly by, and that boring but important task remains undone.
Organizational difficulties: Bills, emails, paperwork, and appointments pile up. Projects get started but then fall through. It’s not that you don’t care; you’re just finding it harder than most people to get started and stay on track until the end.
Hyperactivity: Even if you aren’t climbing on tables and chairs, you might still find yourself tapping your foot, feeling restless in meetings, or experiencing a mind that won’t turn off at night.
Impulsiveness: You might find yourself speaking out of turn, buying things without thinking them through, overcommitting yourself to projects and social engagements, or making snap decisions that you later regret.
Inability to manage time: Many adults with ADHD describe “time blindness,” including frequently arriving late to appointments or arriving super early to avoid missing them, misjudging how long tasks take, and losing track of how much time has passed while engaged in an activity.
Heightened emotional responses: Many adults with ADHD report intense emotional reactivity, including being highly sensitive to criticism, easily irritated, or feeling very upset by minor changes to their environment. They may also experience heightened physical symptoms, such as an elevated heart rate or headaches, after a situation that seems simple enough.
Sleep problems: Sleep difficulties are common in adults with ADHD; up to 70% of adults with ADHD have trouble sleeping (National Institute of Mental Health).
When ADHD goes unrecognized, people often describe their struggles in harsh terms: lazy, careless, irresponsible, and not living up to their potential. Many adults also develop anxiety or depression along the way. Sometimes those are treated while the underlying ADHD is never considered, which may result in little to no improvement in anxiety or depression symptoms.
The ‘hyperactive boy’ stereotype leaves many people out. Girls with ADHD more often struggle with attention than with hyperactivity, often because of cliché societal expectations like “girls are to be seen and not heard.” They are also more likely to internalize their struggles, becoming anxious or depressed rather than disruptive. Researchers have also found that parents and teachers were less likely to recommend ADHD services for girls. Many women are first treated for anxiety or depression, with ADHD never considered. Additionally, girls and women with ADHD may also be especially good at developing ways to cope and hide their symptoms, which makes them even easier to overlook (Madhoo & Quinn, 2014).
As I shared in my first post, signs of ADHD in Black children are sometimes misinterpreted as defiance or misbehavior. A large study found that Black patients were far more likely than White patients to be diagnosed with conduct disorder, and that adult ADHD diagnoses among Black patients were rare (Shalaby et al., 2024). For many Black adults, the question of ADHD was never raised. Finally, most multiply marginalized adults build elaborate systems, work twice as hard, or rely on crises and deadlines to get work done. From the outside, they look fine. Inside, they're exhausted and barely holding it together.
Recognizing yourself in a blog post isn't a diagnosis, but it can motivate you to get curious. An actual ADHD assessment will review your full life history, including your childhood, how your symptoms affect different areas of your life, and other disorders that can mimic ADHD symptoms, such as anxiety, depression, trauma, and sleep issues. You deserve clarity about how your brain functions and receive support that helps you flourish with the brain you have, rather than judgment, shame, and isolation.
Comments