I was thirteen when a teacher slapped the back of my hand to stop me tapping my pen.
Not gently. Hard enough that the pen flew off the desk and twenty-eight heads turned to look at me. "Can you please stop that? It's distracting everyone."
I went red. I sat on my hands for the rest of the lesson. I didn't process a single word she said after that.
ADHD stimming is when your body uses repetitive movements or sounds to regulate your brain. Leg bouncing. Pen clicking. Skin picking. Hair twisting. That thing where you rub the corner of a blanket between your fingers. It's not a nervous habit. It's not a lack of discipline. It's your nervous system doing exactly what it needs to do to keep you functional... and most of us spent our entire childhoods being told to stop.
Which is, when you actually understand the neuroscience, genuinely insane.
Why Does Your Brain Need You to Fidget?
Here's the thing that nobody explained to me until I was well into adulthood. The ADHD brain has lower baseline levels of dopamine and norepinephrine in the prefrontal cortex. That's the part that handles attention, planning, working memory. All the stuff you need to sit in a classroom or an office and actually retain information.
When dopamine is low, your brain goes looking for it. Anywhere it can find it.
And physical movement... even something as small as bouncing your leg or clicking a pen... increases dopamine and norepinephrine in exactly those brain regions. According to research from the University of Central Florida, people with ADHD actually perform better on cognitive tasks when they're allowed to move. The study found that fidgeting was essential for maintaining alertness and working memory. Not optional. Essential.
Let me put that more directly.
The fidgeting isn't a distraction from focus. The fidgeting is focus.
Every teacher who told you to sit still. Every manager who gave you a look for bouncing your knee in a meeting. Every parent who said "stop fidgeting, you're not five." They were asking you to switch off the one thing keeping your brain online.
And we wonder why ADHD kids struggle in schools that demand stillness for six hours a day.
The Stims You Don't Even Realise Are Stims
When most people hear "stimming" they think of the more visible behaviours often associated with autism. Rocking. Hand flapping. And yes, there's significant overlap between ADHD and autistic stimming. But ADHD stimming is often quieter. More hidden. So subtle you might not even recognise you're doing it.
Let me run through a few and see how many make you go "oh."
Leg bouncing. The classic. You're doing it right now, aren't you?
Pen clicking. Or spinning. Or dismantling. I once took apart an entire pen during a meeting and didn't notice until I looked down and there were five separate pieces on the desk in front of me.
Skin picking. Around your nails, your lips, your cuticles. You don't even register you're doing it until you look down and your fingers are raw. This one carries so much shame because it leaves visible marks. People notice. They ask. And you feel like you've been caught doing something wrong.
Lip biting or chewing. The inside of your cheek. The skin on your lips. Gum. The drawstring of your hoodie. Basically anything your mouth can reach.
Hair twisting. Or pulling. Or running your fingers through it over and over again.
Doodling. You weren't ignoring your teacher. You were keeping your brain awake long enough to actually hear them. Doodling is one of the most socially acceptable stims... unless someone decides it means you're not paying attention, at which point it suddenly becomes a problem.
Humming. Tapping rhythms on your thigh. Making little sounds under your breath. Repeating a word or phrase until it stops sounding like a real word.
The phone thing. Picking up your phone, unlocking it, locking it, putting it down, picking it up again twelve seconds later. Not to check anything. Just to give your hands something to do.
If you recognised yourself in three or more of those... yeah. Those are stims. Your body has been self-regulating this whole time. It just never got the credit.
"Can You Stop Doing That?"
Five words that have done more damage than most people realise.
Here's what happens when you tell someone with ADHD to stop stimming. Their brain loses its regulation tool. Now they have to focus using willpower alone, which... good luck. Executive function is already running on fumes. Take away the fidget and you're essentially asking someone to sprint with a broken leg.
But the damage isn't just functional. It's emotional.
Every time you were told to stop tapping, stop picking, stop bouncing, stop humming... your brain filed a message: the thing my body naturally does is wrong. That message, repeated enough times, becomes a belief. And that belief sounds like: "I'm too much. I'm annoying. I can't even sit still like a normal person. What's wrong with me?"
Nothing.
Nothing was wrong with you.
If you've read what we wrote about ADHD and shame, you'll recognise this pattern. The things that define your neurology get treated as character flaws. You internalise them. And you spend years masking them, burning energy to appear "normal," wondering why you're so bloody exhausted all the time.
Research backs this up. The Attention Deficit Disorder Association notes that suppressing stimming behaviours can increase anxiety, tension, and fatigue. Over time, it contributes to emotional burnout. You're spending cognitive energy to stop a behaviour that was saving you cognitive energy.
That's like unplugging your phone charger because you don't like the look of the cable.
Total bullsh*t.
Stimming Is Not the Same as Sensory Overload
Quick distinction because I know some of you are thinking about it. We've written about ADHD and sensory overload before... the thing where your brain can't filter out external input and everything comes in at full volume.
Stimming is the other side of that coin.
Sensory overload is about too much coming in. Stimming is about your body creating its own sensory input to regulate what's going on inside. One is your brain drowning in noise. The other is your body building its own life raft.
Sometimes they work together. When you're overstimulated, you might stim more intensely... picking faster, bouncing harder, clenching your jaw. Your nervous system is trying to cope with the flood. That's not a malfunction. That's self-regulation under pressure.
The NHS lists restlessness and fidgeting as core ADHD symptoms. But as of 2026, the conversation is finally shifting. We're moving from "these are problems to manage" to "these serve a neurological purpose." The fidgeting isn't the disorder. It's the adaptation.
About time, honestly.
How to Actually Work With Your Stims Instead of Against Them
I'm not going to pretend I've fully cracked this. But I've come further than I was five years ago, when my default was to clench my fists under a desk and hope nobody noticed.
Identify your stims. Seriously. Write them down. You'll be surprised how many you have that you've never consciously clocked. Leg bouncing? Pen clicking? That thing you do with your jaw? Once you name them, you can start working with them instead of against them.
Find quieter versions when you need them. Not because your stims are wrong. But because we live in a world that hasn't caught up yet. A textured ring you can spin under the desk. A smooth stone in your pocket. A quiet fidget that gives your hands something to do without drawing the attention that leads to the comments that lead to the shame. It's a compromise. It shouldn't have to be. But here we are.
Give yourself actual permission. This sounds small but it isn't. Tell yourself, out loud if you have to: "This is my brain regulating itself and that's okay." Because decades of "stop doing that" have built a wall of guilt around something that is, neurologically speaking, one of the best things your body does for you.
Notice when suppression is costing you. Next time you're in a meeting and you're forcing yourself to sit completely still... notice what happens to your focus. Does it improve? Or does it nosedive? Most people find that the energy they spend staying still completely obliterates their ability to listen. You're concentrating on not moving instead of concentrating on the thing you're supposed to be concentrating on.
What a waste.
Protect the stims that help. Address the ones that hurt. Not all stims are created equal. Leg bouncing? Crack on. Skin picking until you bleed? That one deserves attention. Not shame... attention. There's a difference. If a stim is causing you physical harm, it's worth exploring an alternative that serves the same function without the damage. According to ADHD UK, replacement strategies work best when they match the sensory profile of the original stim. Same type of input, safer delivery.
Your Body Was Never the Problem
I think about that teacher sometimes. The slap on the hand. The pen clattering across the floor. Twenty-eight pairs of eyes.
She thought she was teaching me discipline. She was teaching me that my body couldn't be trusted. That the things it did naturally were wrong. That the way my brain worked was a disturbance to be corrected.
I spent fifteen years trying to sit still.
And then I found out that the fidgeting was the only reason I'd been able to concentrate at all.
If you're reading this and your leg is bouncing... leave it. If your fingers are working at something... let them. If you've got a pen in your hand and you're clicking it without thinking...
That's not a flaw.
That's your brain doing what it was always supposed to do. And everyone else can adjust.
Curious what kind of neurodivergent energy you're running on? Take the quiz and find out.
