ADHD and Anxiety: Why They Look Similar but Need Different Support | The STILL Method
ADHD · Anxiety · Neurodivergence
ADHD and Anxiety: Why They Look Similar but Need Different Support
They share symptoms. They are often confused. They frequently co-exist. But they involve different underlying mechanisms, and that difference often changes everything about what actually helps.
~50%of adults with ADHD also experience an anxiety disorder — estimates vary by study and setting
700k+people cited in parliamentary discussions as waiting for ADHD assessment in England (2025)
18–36waiting times for ADHD assessment are often many months and can extend to years depending on area and provider
If you are a parent who has been told their child has anxiety but something doesn't quite fit, or an adult who has managed anxiety for years and still feels like something is being missed, this page is written for you.
ADHD and anxiety are not the same thing. They are not interchangeable. But they produce overlapping behaviours that are genuinely difficult to tell apart, and in a significant proportion of people both are present at the same time. Getting the distinction right is not just clinically important. Understanding which mechanism is more prominent can mean support that is better matched to what is actually happening.
This page explains the mechanism behind each, what the key diagnostic signals are, the largely underrecognised concept of secondary anxiety, and what different support actually looks like in practice. It does not replace a clinical assessment, but it gives you the understanding to have better conversations with professionals, schools, and coaches.
The same behaviour, different underlying mechanisms
Take difficulty concentrating. It is present in both ADHD and anxiety. But the underlying mechanism tends to differ, and that matters enormously for what helps.
In ADHD
Differences in attention regulation and executive function
ADHD involves differences in how the brain regulates attention, inhibition, and executive control — across frontostriatal and related networks involving dopamine and norepinephrine. The result is that focus difficulties tend to be consistent across contexts, not tied to mood or perceived threat. Boredom, low-interest tasks, and anything without immediate reward or urgency are particularly challenging. These reflect enduring differences in attention and executive functioning rather than a response to any particular situation.
Key signal: Attention difficulties tend to occur consistently across settings, including when calm, not only under pressure
In Anxiety
A brain responding to perceived threat
In anxiety, elevated arousal and heightened threat monitoring redirect cognitive resources away from focused attention. The prefrontal cortex tends to work less efficiently under this threat state. Concentration difficulties are more closely tied to specific situations, worries, or fears — and often ease as perceived threat reduces, though the picture varies considerably between individuals and anxiety types.
Key signal: Focus is more disrupted in worried or uncertain situations. Calmer contexts are often more manageable
Both can produce a child who stares out of the window in class. But in one case the brain is struggling to regulate where attention goes, and in the other it is occupied monitoring for danger. The support those two children may need is not always the same.
What is this behaviour about?
Select a behaviour below to explore what may be driving it and how the mechanisms differ. This is not a diagnostic tool
👆Select a behaviour on the left to understand what may be driving it
● Can be both
Difficulty concentrating
This is the most commonly confused symptom, and the mechanism is the most important thing to understand. Both ADHD and anxiety produce concentration difficulties, but the pattern is distinctly different.
If ADHD is driving it
Concentration difficulties happen consistently across settings, even when the person is calm, even on things they want to do. An ADHD brain is not failing to focus because something is wrong. Its attention regulation system simply works differently. Boredom is a particularly strong trigger because low-stimulation tasks produce almost no dopamine signal to drive engagement.
If anxiety is driving it
Concentration is disrupted specifically when worry is present. The brain is using cognitive resources to scan for threat and anticipate what might go wrong. In safe, low-stakes situations, focus is significantly better. The person often knows exactly why they cannot concentrate: fear of failure, social evaluation, uncertainty about the outcome.
What helps: For ADHD, structure, novelty, short bursts, and removing demands that rely on sustained attention without external scaffolding. For anxiety, reducing the threat signal first through nervous system regulation and reducing uncertainty so the cognitive resources become available again. Teaching focus strategies to someone in an anxiety state is unlikely to work.
● Can be both — different reason
Avoiding starting tasks
Task avoidance is one of the most misunderstood symptoms in both conditions. It looks identical from the outside. Nothing gets done. But what is happening internally is very different.
If ADHD is driving it
The ADHD brain struggles with task initiation because starting a task requires the prefrontal cortex to generate a motivation signal strong enough to override competing inputs. If the task is low-interest or the outcome feels too distant, the brain simply cannot generate sufficient activation to begin. This is not laziness. It reflects an executive function system that runs on interest and urgency rather than intention alone.
If anxiety is driving it
Avoidance in anxiety is driven by fear of failure, fear of being judged, or fear of the task confirming a negative belief. The person often thinks about the task extensively and feels guilty, but the threat response prevents engagement. Perfectionism is often present: better not to start than to start and do it imperfectly.
What helps: For ADHD, external accountability, breaking tasks into the smallest possible first step, body doubling, and working with the brain's interest-based motivation rather than against it. For anxiety, addressing the fear beneath the avoidance, building evidence of capability, and nervous system regulation before attempting the task.
● Can be both
Restlessness and fidgeting
Physical restlessness appears in both conditions but comes from opposite directions. In one case a brain is seeking stimulation; in the other, a body already has too much of it.
If ADHD is driving it
Hyperactivity and fidgeting in ADHD are partly the brain's attempt to generate its own stimulation. Movement creates sensory input that helps regulate arousal. It is not a behaviour problem. Many people with ADHD concentrate significantly better when they can move, fidget, or doodle simultaneously. Restricting movement often makes things worse.
If anxiety is driving it
Restlessness in anxiety is driven by nervous energy — the body has produced adrenaline in response to a perceived threat and that adrenaline needs somewhere to go. The person typically feels keyed up, on edge, or unable to relax. Unlike ADHD restlessness, it is usually tied to specific situations or periods of worry rather than being constant across all settings.
What helps: For ADHD — allow and accommodate movement as a regulatory tool rather than suppressing it. For anxiety — movement is also helpful but in a different way: aerobic activity that discharges adrenaline, combined with work on the nervous system's threat detection, rather than simply allowing stimulation-seeking.
● Usually both — grief and trauma also possible
School refusal and avoidance
School avoidance is one of the most distressing presentations for families and one of the most complex to understand. It is often not wilful and is better understood through distress, overwhelm, and nervous system activation rather than choice or defiance.
If ADHD is driving it
School is an environment specifically challenging for ADHD brains. Long periods of sustained attention, suppression of movement, and constant task-switching on the teacher's schedule rather than the child's all add up. The cumulative exhaustion of masking and compensating, combined with repeated experiences of failure or negative feedback, can create secondary anxiety about school that then makes attendance even harder.
If anxiety is driving it
Anxiety-driven school avoidance is usually specific: social anxiety, performance anxiety, a particular teacher, a particular event. The child is not avoiding school in general but avoiding a threat that exists within the school environment. Physical symptoms such as stomach aches, headaches, and nausea are very common and are real. They are the body's anxiety response, not fabrication.
What helps:Parents have legal protections when anxiety or ADHD is driving absence. In both cases, forcing return without addressing the underlying cause typically makes things worse. The nervous system needs to be addressed before reintegration is attempted.
● More strongly associated with ADHD
Constantly forgetting things
Persistent forgetfulness, losing things, forgetting conversations, missing appointments, not being able to recall what was just said, is closely associated with ADHD. It is less characteristic of anxiety as a primary driver, though anxiety can contribute.
If ADHD is driving it
Working memory is the brain's ability to hold information in mind while using it. It is consistently affected in ADHD. This is not carelessness. The information does not get encoded reliably into short-term storage, meaning it genuinely is not available for retrieval. People with ADHD are not forgetting because they don't care. The encoding process itself is disrupted. This is also why written reminders, external systems, and visual prompts work much better than simply trying harder to remember.
If anxiety is contributing
Anxiety can impair working memory through cognitive overload — when the brain is occupied processing worry, less resource is available for encoding new information. But anxiety-related forgetting tends to be more situational (under pressure, during high-stress periods) rather than the persistent, cross-context forgetfulness characteristic of ADHD.
What helps: External memory systems rather than internal strategies that rely on remembering to remember. Structured routines, visual calendars, written lists, and reducing the number of things that need to be held in working memory simultaneously. Criticising forgetfulness in ADHD is counterproductive and increases the secondary anxiety it produces.
● Strong signal in both — especially ADHD
Emotional outbursts and dysregulation
Emotional dysregulation, meaning intense, rapid, sometimes disproportionate emotional responses, is one of the most disabling features of ADHD that is rarely discussed in standard descriptions of the condition. It is also highly relevant to anxiety.
If ADHD is driving it
The prefrontal cortex, less efficient in ADHD, is also involved in regulating emotional responses. When it is working at reduced capacity, emotions can arrive at high intensity before regulation has had time to engage. This is why ADHD-related emotional responses can sometimes seem disproportionate. Rejection Sensitive Dysphoria (RSD), the intense emotional pain many people with ADHD describe in response to real or perceived rejection or criticism, is a widely recognised experience in ADHD communities and clinical practice, though it is not yet a formal DSM diagnostic criterion. For many people with ADHD, it is nonetheless one of the most disabling features of the condition.
If anxiety is driving it
Anxiety-driven dysregulation typically presents as irritability, tearfulness, or meltdowns specifically when a threat is present: before a test, when asked to do something frightening, when routine is disrupted. Outside of those trigger situations, the person is often calmer. The emotional response is directed at the perceived threat.
What helps: In both cases, co-regulation from a calm adult matters more than consequences or explanations in the moment. The nervous system cannot process logic while dysregulated. Addressing regulation first, then reflection, is the correct sequence. Punishing dysregulated behaviour in either condition consistently makes things worse.
● Very common in both
Can't settle to sleep
Sleep difficulties affect the majority of people with ADHD and are near-universal in anxiety. The causes are different and so is the most effective approach.
If ADHD is driving it
Many people with ADHD experience delayed sleep patterns and feel more alert later in the day. The ADHD brain also tends to struggle to disengage from stimulating activity and transition to the lower-arousal state required for sleep. Racing thoughts at bedtime in ADHD are often interesting rather than anxious — the mind jumping between topics it finds engaging rather than spiralling around fear or worry.
If anxiety is driving it
Anxiety-driven sleep difficulties typically involve worry racing: rehearsing past events, anticipating future ones, catastrophising, being unable to stop a thought spiral. The body is in a state of elevated arousal because the threat-detection system has not switched off. Physical tension, racing heart, and a sense of dread are common. The thoughts are typically negative and fear-focused rather than interest-driven.
What helps: For ADHD sleep — consistent sleep/wake schedule, removing screens before bed, physical exercise, and sometimes a brief period of low-stimulation activity to allow arousal to drop. For anxiety sleep — addressing the worry content, nervous system regulation practices, and often work on the specific fears that become active at night. Our sleep coaching approach addresses both mechanisms.
● Common in both — different reason
Avoiding social situations
Social avoidance appears in both conditions but for very different reasons, and the support required is quite different.
If ADHD is driving it
Social difficulties in ADHD often stem from impulsivity (speaking before thinking, interrupting), difficulty following the rules of conversation, missing social cues, or saying something unintentionally hurtful. Repeated experiences of rejection, being told off, or feeling different can produce social avoidance, but the root tends to be executive function and processing differences rather than fear-based threat detection. The experience many people with ADHD describe as Rejection Sensitive Dysphoria can amplify this significantly.
If anxiety is driving it
Social anxiety is driven by intense fear of negative evaluation: the sense that others are judging, that something embarrassing will happen, that they will be found out. The threat system is activated by the presence of other people. Avoidance reduces the anxiety temporarily but maintains and worsens it over time. Physical symptoms such as blushing, sweating, and shaking are common and often increase awareness and distress.
What helps: These require genuinely different approaches. ADHD social difficulties are often helped by specific social skills coaching and explicit teaching of conversational rules that neurotypical people absorb implicitly. Social anxiety responds to gradual, collaborative exposure and addressing the underlying threat beliefs.
● More strongly associated with ADHD
Hyperfocusing on certain things
The ability to become completely and intensely absorbed in specific topics or activities, to the exclusion of everything else including basic needs like eating and sleeping, is one of the most recognisable features of ADHD and is not characteristic of anxiety.
Why this happens in ADHD
ADHD brains are interest-driven rather than intention-driven. When the brain encounters something highly novel, rewarding, or personally compelling, it can generate intense, sustained focus, sometimes to a degree that neurotypical people rarely experience. This is why ADHD is not simply "can't focus." It is more accurately "can't easily regulate where focus goes." The same brain that cannot stay on a boring school task can be completely absorbed in something it finds captivating for six hours.
Why this matters for support
Hyperfocus is often a strength when channelled into something useful: deep expertise, creative work, sustained engagement with meaningful projects. The challenge is switching out of it, particularly when it is time to do something more important. Support should acknowledge and work with this pattern rather than treating all intense focus as problematic.
What helps: External transition cues (timers, agreements about end points), and framing the ADHD brain's interest-based motivation as a feature to work with rather than a flaw to overcome. If hyperfocus is present alongside significant anxiety, the combination often means ADHD-primary — which is important clinically.
● More strongly associated with anxiety — context matters
Racing thoughts at night
Racing thoughts at bedtime are common in both conditions, but the quality and content of the thoughts is usually very different and can help distinguish the driver.
If anxiety is driving it
Anxiety-driven racing thoughts are typically worry-focused and negative: replaying past events with shame, anticipating future failures, imagining catastrophic outcomes, being unable to stop a thought once it has started. The thoughts have a compulsive, intrusive quality. There is often a physical component including tight chest, stomach churning, and a sense of impending dread. Reassurance brings temporary relief, then the doubt returns.
If ADHD is contributing
Racing thoughts in ADHD at night often have a different character: interesting, creative, jumping between topics, not particularly negative. The mind is doing what it does all day but without the daytime distractions to compete. It can feel energising rather than distressing. However, people with both ADHD and anxiety often experience both types of racing thought, and the ADHD pattern can allow anxious thoughts to spiral unchecked.
What helps: For anxiety — structured worry time earlier in the evening, a physical transition ritual before bed, addressing the specific fears rather than trying to stop the thoughts directly. For ADHD at night — externalising the interesting thoughts (writing them down removes the pressure to remember them) and a consistent wind-down routine that reduces stimulation gradually.
Secondary anxiety: the concept that changes everything
One of the most important and least understood features of the ADHD-anxiety relationship is secondary anxiety. This is anxiety that does not originate in a dysfunctional threat-detection system. It is anxiety that develops over time as a direct consequence of living with unrecognised or unsupported ADHD.
1
ADHD goes unrecognised or unsupportedThe child or adult works significantly harder than others to achieve the same results. Tasks take longer. Things get lost. Deadlines are missed. Social situations misfire.
2
Repeated failure and negative feedback accumulatesOver months and years, the person builds an internal narrative: lazy, careless, unreliable, failing to live up to potential. Teachers, employers, and sometimes family members confirm this narrative.
3
The nervous system learns to brace for the next failureAnticipatory anxiety develops. A constant underlying dread of the next mistake, the next criticism, the next time the ADHD brain will let the person down. This is genuine anxiety, built on genuine experience.
4
Anxiety gets treated, ADHD doesn'tThe anxiety is visible and distressing. The ADHD is less obvious, especially in girls, adults, and anyone who has developed sophisticated masking strategies. Anxiety treatment helps partially, but the source keeps producing more anxiety.
5
The cycle often persists unless ADHD-related difficulties are also recognised and supportedWhen ADHD support is added, secondary anxiety often improves more substantially than it did through anxiety treatment alone, because the source contributing to it is being addressed. This is not universal, but it is a pattern clinicians frequently observe.
This is why understanding which came first matters. Where anxiety is secondary to ADHD, treating the anxiety in isolation may produce only partial or temporary improvement. Recognising the ADHD as part of the picture and addressing it alongside the anxiety often produces better outcomes. This is not universal, but it is a pattern that ADHD clinicians and researchers frequently observe.
Particularly important for girls and women
Why ADHD is missed and anxiety is diagnosed instead
ADHD diagnostic criteria were historically developed based on studies of boys: hyperactive, disruptive, externally obvious. Girls with ADHD tend to present very differently. They are more often inattentive rather than hyperactive, internally restless rather than externally disruptive, and socially motivated to mask and compensate.
The result is that girls with ADHD are frequently described as anxious, sensitive, or emotionally dysregulated, and are diagnosed with anxiety disorders or depression while their ADHD goes unrecognised. Many women spend years in anxiety treatment before anyone considers ADHD as part of the picture. The anxiety is real and deserves treatment. But if the ADHD underneath it is never identified, the picture remains incomplete.
The same pattern applies to any child who masks well in structured environments, appearing fine at school while falling apart at home, where the effort of suppressing symptoms all day finally gives way.
What different support actually looks like
This is where the distinction matters most practically. The support approaches that work for ADHD and anxiety overlap in some areas, as both benefit from a nervous system-informed approach, but they differ significantly in their emphasis.
ADHD-focused support
Working with the brain's interest-based motivation rather than expecting intention to be enough
External scaffolding: written lists, visual calendars, alarms, body doubling
Reducing the number of things held in working memory simultaneously
Allowing and accommodating movement as a regulatory tool
Breaking tasks into the smallest possible steps, with the first step being effortlessly achievable
Understanding and accommodating hyperfocus rather than suppressing it
Addressing the shame and identity damage of years of being misunderstood
Explicit social rules coaching where social difficulties exist
Anxiety-focused support
Nervous system regulation first. The brain processes fear-based learning much less effectively while in a threat state
Gradual exposure to feared situations, with the nervous system regulated beforehand
Addressing the belief beneath the anxiety, not just the behaviour it produces
Building evidence of capability to counter catastrophic predictions
Reducing reassurance-seeking, which maintains anxiety over time
Separating what can be controlled from what cannot
Predictability and routine as a nervous system anchor, not a long-term solution
Exposure-based approaches, the evidence-based standard for many anxiety problems, should be graded, collaborative, and never coercive
When both are present: The sequence matters. ADHD-related chaos and shame often maintain the anxiety. Starting with the ADHD, reducing the daily chaos, building self-understanding, and replacing shame with an accurate picture of how the brain works, frequently makes the anxiety significantly more tractable. The two can and should be addressed together, but understanding which is driving which at any given moment changes what to prioritise.
700k+waiting for ADHD assessment in England
You do not need a diagnosis to begin getting support. Waiting times for ADHD assessment are often many months and can extend to years depending on area and provider, meaning a long period during which difficulties continue unaddressed. There is good evidence that extended waits are associated with worsening difficulties, particularly secondary mental health impacts. Coaching that works with the nervous system, addressing the patterns that are present regardless of what they are labelled, is available now and does not require a clinical referral.
Understanding what is driving the behaviour is the first step. The second is support that matches it.
The STILL Method works with the nervous system first, which is why it is effective for ADHD, anxiety, and the significant number of people carrying both. Train as an ADHD coach, an anxiety coach, or both.
