ADHD Stimming: What It Looks Like and Why It Happens

Short answer: Stimming, short for self-stimulatory behaviour, means repetitive body movements or noises, such as rocking, humming or fiddling with a pen.¹ It’s often talked about in relation to autism, but fidgeting, tapping your hands or feet and, in adults, feeling restless are all on the official list of ADHD symptoms.² One small study in children even found that more movement went with better performance on working-memory tasks in those with ADHD.³ Stimming is generally only a concern if it causes injury or seriously gets in the way of daily life.¹

What is stimming?

Stimming is short for self-stimulatory behaviour. The Raising Children Network, an Australian Government-funded parenting website, describes it in a guide written about autistic children and teenagers as repetitive body movements or noises — for example, hand flapping, finger flicking, rocking, humming, repeating words or watching spinning objects.¹

You don’t need a diagnosis to stim. Everyone does it sometimes — pacing when you’re anxious, say, or fiddling with a pen in a boring meeting.¹

Do people with ADHD stim?

They can — although in ADHD the same kinds of behaviour are usually described as fidgeting or restlessness. The official list of hyperactivity and impulsivity symptoms includes fidgeting with or tapping hands or feet, or squirming in a seat, and notes that in adults this can show up as feeling restless.² The Australian Government’s healthdirect service also lists fidgeting and squirming more than others among the symptoms of ADHD.⁴

In adults, hyperactivity can be subtle: feeling restless and unable to relax.⁵ If restlessness has been part of your life since childhood, alongside problems with attention, you might find combined-type ADHD worth reading about.

Common examples in adults with ADHD

Stims vary a lot from person to person. Examples include:

• Legs and feet: bouncing a knee, tapping a foot, pacing during phone calls
• Hands: clicking pens, doodling, drumming fingers, spinning a ring, twirling hair, fiddling with keys or a hair tie
• Mouth and voice: chewing gum or pen lids, humming, whistling, repeating a phrase
• Whole body: rocking or swivelling in a chair, stretching, getting up to walk around
• Objects: fidget toys, putty, stress balls, flipping a phone case on and off

Why do people with ADHD stim?

There’s no single explanation, but a few ideas have some research behind them.

Movement may help some people focus

In a small 2015 study of boys aged 8–12, 29 with ADHD and 23 without, more movement during working-memory tasks went with better performance in the boys with ADHD — although their performance still wasn’t typical — and with slightly worse performance in the boys without ADHD.³ The authors suggested that movement may serve a purpose in ADHD.³ It was a small lab study in children, so it can’t tell us much about adults, but it’s a reason not to assume fidgeting is always a problem.

Seeking sensation

Some stimming may be about getting sensory input. A 2025 review that pooled 30 studies found that people with ADHD reported more sensory differences than people without ADHD in all four areas measured, including sensation seeking — as well as being more sensitive to sensory input, avoiding it, and not noticing it.⁶ Most of those studies were in children, and only 9 were judged at low risk of bias.⁶

Calming down and coping with feelings

The Raising Children guide notes that people stim to help them cope with strong emotions, such as anxiety, anger, fear or excitement, and with sensory overload — and that stimming can help them focus or calm down.¹ Difficulties regulating emotions are common in ADHD: they affect up to 40–50% of children with ADHD and are also common in adults.⁷ If noise, light or crowds often feel like too much, see ADHD overstimulation.

ADHD stimming vs autistic stimming

A stim on its own isn’t a reliable clue to which condition, if any, is behind it. Everyone stims sometimes, and some features of autism overlap with ADHD.⁸

The two conditions also often occur together. Autism co-occurs with ADHD in 20–50% of cases,⁷ and ADHD is among the most common co-occurring diagnoses in autistic people.⁹ The Australian ADHD Guideline warns clinicians that a co-occurring condition can lead to ADHD being missed, or can itself be missed when ADHD symptoms are present.¹⁰

So rather than trying to work out which “type” of stim you have, it’s more useful to look at the whole picture — which is what a proper assessment does. If you think autism may be part of yours, see ADHD and autism (AuDHD).

Is stimming bad? Should you stop?

Usually not. Stimming is generally a concern only if it’s self-injurious — for example, biting or picking that damages your skin — or if it seriously interferes with learning, work or everyday life.¹

There’s also a case for leaving harmless stims alone. Raising Children notes that stopping harmless stimming can make autistic people more anxious, angry or sad.¹ That advice is about autistic children and teenagers rather than adults with ADHD, but the principle is worth keeping in mind: if a stim isn’t hurting you or anyone else, there’s usually no need to fight it.

If a stim is noisy or distracting for the people around you, try swapping it for a quieter one rather than trying to stop altogether.

Stimming at work or uni

Some discreet options to try:

• a spinner ring, smooth stone, putty or stress ball in your pocket or under the desk
• doodling or taking handwritten notes while you listen
• chewing gum, where that’s acceptable
• a standing desk, footrest or wobble cushion
• walking meetings, taking calls on the move, or short movement breaks between tasks
• sitting at the end of a row or the back of the room, so movement is less noticeable

You can also talk to your manager, or your uni’s disability or accessibility service, about adjustments — see ADHD at work. If you find yourself working hard to hide your stims, you may also find ADHD masking useful.

Does stimming mean you have ADHD?

No. Everyone stims sometimes, and fidgeting on its own can have many everyday causes, from boredom to nerves.

ADHD is diagnosed on a long-standing pattern of symptoms, not one behaviour. People aged 17 and over need five symptoms from one of the two official lists, and symptoms must have been present before age 12.² In Australia, an adult diagnosis needs evidence that symptoms began in childhood.⁴

If restlessness and stimming come with other difficulties — such as being easily distracted, forgetting daily tasks, losing things or interrupting others²⁴ — it may be worth talking to your GP. Only a proper assessment can tell.

When to talk to a GP

See your GP if stimming:

• is causing injury, such as broken or sore skin
• is getting in the way of work, study, sleep or relationships
• comes with intense anxiety, distress or frequent overwhelm.

Your GP can help work out what’s going on and whether an assessment for ADHD, autism or another condition makes sense.

Getting support: If you’re hurting yourself on purpose to deal with distress, or you’re struggling to cope, Lifeline offers 24-hour crisis support on 13 11 14, or you can text 0477 13 11 14. If life is in danger, call 000.¹¹

Frequently asked questions

What is stimming?

Stimming, short for self-stimulatory behaviour, means repetitive movements or sounds, such as rocking, humming, finger flicking or repeating words. Everyone does it sometimes, like pacing when anxious or fiddling with a pen during a dull meeting.

Do people with ADHD stim?

They can. In ADHD it’s usually called fidgeting or restlessness. Fidgeting with or tapping your hands or feet is one of the official ADHD symptoms, and in adults hyperactivity can show up as a feeling of restlessness.

Why do people with ADHD stim?

There’s no single reason. Movement may help some people with ADHD focus, although the evidence comes from a small study in children. Stimming may also be a way of seeking sensory input, or of calming down when emotions run high.

What’s the difference between ADHD and autistic stimming?

A stim on its own isn’t a reliable clue to which condition, if any, is behind it. Autism and ADHD often occur together, so a proper assessment looks at the whole picture rather than one behaviour.

Is stimming bad?

Usually not. Stimming is generally only a concern if it causes injury or seriously interferes with everyday life, and in that case it’s worth talking to your GP.

Does stimming mean you have ADHD?

No. Everyone stims sometimes. ADHD is diagnosed on a long-standing pattern of symptoms that started in childhood, so only a proper assessment can tell.

Next steps

Read ADHD symptoms in adults and ADHD and autism (AuDHD), or start with the free ADHD self-assessment.

This article is general information only and is not medical advice. Only a qualified health professional can diagnose ADHD. ADHD GP is a private telehealth clinic staffed by AHPRA-registered Australian GPs.

Book your ADHD assessment

References

1. Raising Children Network (Australian Government funded). Autism and stimming. 2025. raisingchildren.net.au — Stimming (self-stimulatory behaviour) is repetitive movements or noises; everyone stims sometimes, such as fiddling with a pen in a boring meeting; it can help manage strong emotions and sensory overload.
2. American Psychiatric Association. What is ADHD?. 2025. www.psychiatry.org — ADHD is one of the most common mental disorders affecting children; symptoms must be present before age 12; an estimated 8.4% of children and 2.5% of adults have ADHD; listed symptoms include fidgeting, feeling restless (in adults), talking too much and forgetting daily tasks.
3. Sarver DE, Rapport MD, Kofler MJ, et al. Hyperactivity in Attention-Deficit/Hyperactivity Disorder (ADHD): Impairing Deficit or Compensatory Behavior?. Journal of Abnormal Child Psychology. 2015. PubMed PMID 25863472 — In boys aged 8–12, more movement during working-memory tasks predicted better (though not typical) performance in those with ADHD, and slightly worse performance in typically developing boys.
4. healthdirect (Australian Government). Attention deficit hyperactivity disorder (ADHD). 2025. www.healthdirect.gov.au — ADHD is a neurodevelopmental condition that begins in early childhood; around 1 in 20 people in Australia has ADHD; it is partly genetic; an adult diagnosis requires evidence that symptoms began in childhood; learning difficulties can occur alongside it.
5. Healthy Male (funded by the Australian Government). Adult ADHD diagnosis in Australia: What you need to know. 2026. healthymale.org.au — In adults, impulsivity can look like excessive spending, risk-taking, conflict with others, interrupting and talking excessively; managing finances and meeting work deadlines can be difficult; some adults ‘hyperfocus’ for hours on activities that interest them, and hyperactivity can show as feeling restless and unable to relax.
6. Jurek L, Duchier A, Gauld C, et al. Sensory Processing in Individuals With Attention-Deficit/Hyperactivity Disorder Compared With Control Populations: A Systematic Review and Meta-Analysis. Journal of the American Academy of Child and Adolescent Psychiatry. 2025. PubMed PMID 40250555 — Meta-analysis of 30 studies (5,374 participants, 7 studies in adults): people with ADHD reported more sensory sensitivity, avoiding, low registration and seeking than controls; only 9 studies were low risk of bias.
7. Australian ADHD Professionals Association. About ADHD (Australian ADHD Guideline). 2022. adhdguideline.aadpa.com.au — ADHD affects 6–10% of Australian children and 2–6% of adults; heritability 70–80%; symptoms begin before 12 though diagnosis may come later; 60–86% persist into adulthood; inattentive presentation most prevalent; up to 80% of adults have another mental health condition, such as depressive, bipolar, anxiety or substance use disorders, and cluster B and C personality disorders are more common; describes executive-function difficulties (working memory, planning, sustained attention, inhibitory control), brain-maturation and dopamine differences.
8. healthdirect (Australian Government). Autism. 2025. www.healthdirect.gov.au — The term neurodivergent also describes people with conditions such as dyslexia and ADHD; some features of autism overlap with ADHD.
9. Lai MC, Kassee C, Besney R, et al. Prevalence of co-occurring mental health diagnoses in the autism population: a systematic review and meta-analysis. Lancet Psychiatry. 2019. PubMed PMID 31447415 — ADHD is among the most common co-occurring diagnoses in autistic people.
10. Australian ADHD Professionals Association. Australian ADHD Guideline — Chapter 2: diagnosis. 2022. adhdguideline.aadpa.com.au — Clinicians should know which conditions commonly co-occur with ADHD, as a co-occurring condition may result in a missed ADHD diagnosis, or a missed co-occurring condition when ADHD symptoms are present.
11. Lifeline Australia. Lifeline home page. 2026. www.lifeline.org.au — Lifeline offers 24-hour crisis support on 13 11 14 (or text 0477 13 11 14); if life is in danger, call Triple Zero (000).

Sources were last checked on 5 October 2026. See all sources used on this site on our Sources page.