ADHD overwhelm: why small things can feel so big

Have you ever lost it over your clothes feeling uncomfortable? The label scratching your neck, your jeans digging in, a jumper that suddenly feels unbearable. Or maybe it's someone chewing too loudly, a cupboard door banging, your partner asking you one more question, or your phone going off just as you're trying to concentrate.

And even as you're reacting, part of you is thinking: why is this bothering me so much? Usually, it isn't really about the clothes, the cupboard, the chewing or the notification. It's everything that came before it.

Maybe you woke up already tired. You rushed out of the house. You spent two hours concentrating in a meeting. The lights were too bright. Someone's perfume was giving you a headache. You forgot to eat lunch. You've answered 14 messages, made hundreds of tiny decisions and spent most of the day trying to look like you're coping perfectly well.

Then one more thing happens, and suddenly your nervous system says: nope. For those of us with ADHD, this experience can make much more sense when we understand something called the window of tolerance.

Your nervous system has a comfort zone

The window of tolerance describes the state where our nervous system feels regulated enough for us to function. When we're within our window, we can think relatively clearly, manage our emotions, and respond to everyday problems without becoming completely overwhelmed.

That doesn't mean everything feels easy. Things can still annoy us, we can still get upset, and we can still have difficult days. The difference is that we have enough capacity to deal with what's happening.

Think about it like having enough charge left in your internal battery. If someone sends you a slightly irritating email when you're rested, fed and having a decent day, you might roll your eyes and get on with it. Receive exactly the same email after six hours of meetings, no lunch, poor sleep and constant sensory stimulation, and it's a completely different story.

ADHD can make that capacity easier to overload

ADHD isn't simply about attention. We can also experience difficulties with emotional regulation, executive functioning, sensory processing, impulse control and shifting our attention. That means an ordinary day can require an enormous amount of invisible effort, and it's exhausting.

Throughout the day, you might be filtering out background noise, trying not to interrupt, remembering what you're meant to be doing and dragging your attention back into the meeting. At the same time, you're trying to read someone's tone, stop yourself from checking your phone, remember where you've put your keys, start the task, stop the task, and not react to what's irritating you.

Many of us with ADHD have spent years believing we should simply be able to cope better. We may have grown up hearing things like "You're too sensitive", "Why are you making such a big deal out of this?" "You just need to try harder" or "Everyone else manages."

Over time, constantly pushing ourselves and overriding what our bodies are telling us can make it harder to notice we're becoming overwhelmed until we're already there.

When your system goes up

One way we can move outside our window of tolerance is into hyperarousal. This is the wired, overstimulated, everything-is-too-much state. Personally, I know I've tipped into it when the dog lead starts bothering me – which is not the easiest thing to explain to someone who isn't neurodivergent.

In this state, you might notice yourself becoming:

• unusually irritable
• restless or unable to sit still
• hypersensitive to sounds, smells or lights
• anxious or on edge
• emotionally reactive
• unable to stop racing thoughts
• physically tense
• desperate to escape whatever is happening.

Suddenly, the person tapping their pen isn't simply tapping their pen; it feels like they're tapping it directly against your nervous system. And once we're already in this state, another tiny demand can create a disproportionately big reaction.

When your system goes down

Overwhelm doesn't always look emotional or frantic, though. Sometimes the nervous system goes in the opposite direction. This is hypoarousal, often described as shutdown. For me, it's when I physically can't get moving and even eating feels like an effort.

In this state, you might feel:

• exhausted even though you've barely moved
• disconnected or numb
• unable to make a simple decision
• completely unmotivated
• mentally foggy
• unable to find your words
• stuck scrolling because doing anything else feels impossible
• like you want everyone to leave you alone.

This is one reason ADHD can feel so confusing. At 2 pm, you can be racing around, talking quickly, feeling anxious and trying to do 17 things at once. By 7 pm, you're lying on the sofa unable to reply to a WhatsApp message. It's the same brain and the same nervous system – just a different response to overload.

The crash after holding it together

This pattern comes up a lot. Someone manages beautifully at work all day. They're professional, polite, and productive, and nobody looking at them would necessarily know how much effort goes into holding everything together.

Then they walk through the front door and collapse. Or their partner says something completely harmless and gets a huge emotional reaction, leaving both of them wondering where on earth that came from. But often, the reaction didn't start in that moment. The nervous system has been collecting little stressors all day, and the cupboard door was simply number 47.

Understanding this matters, because it changes the question from "What's wrong with me?" to "What has my nervous system been dealing with today?" – and that's a much more useful question to ask.

So, how do we create more capacity?

The aim isn't to become someone who is never overwhelmed; that's not realistic. Instead, we can learn to recognise what pushes us towards the edges of our window, and what helps bring us back.

Start with the body, not the argument in your head

When your nervous system is highly activated, telling yourself to "calm down" isn't always particularly effective. Your body needs information that tells it things are safe. That might look like:

• slowing your breathing, particularly the exhale
• putting something cold against your face
• using a weighted blanket
• walking or moving your body
• trying bilateral tapping, gently alternating from side to side
• noticing five things around you that you can see
• stepping away from noise or bright light for a few minutes.

You don't necessarily need to understand everything you're feeling before you regulate it. Sometimes we need to help the body first and have the conversation afterwards.

Stop waiting until you're at 100%

One of the biggest changes you can make is learning what 60% or 70% overwhelmed feels like. What happens before the explosion or shutdown? Maybe you start talking faster, or your shoulders tense. Maybe every sound starts annoying you, you become more negative, or you can no longer decide what to do next.

Those are useful signals, and the earlier you notice them, the easier it is to intervene. Instead of waiting until you desperately need two days alone, perhaps you need ten quiet minutes now.

Check the boring basics

I know, it's not glamorous. But before analysing your entire life, check in with yourself: Have I eaten? Have I had enough water? How did I sleep? Have I moved today? Have I been around people constantly? Have I had any time without stimulation?

We sometimes assume a huge emotional reaction must require a huge psychological explanation, when actually your brain has been running on coffee and half a cereal bar since 8 am. Your physiology matters.

A proper meal isn't going to solve every ADHD difficulty, obviously, but trying to emotionally regulate an exhausted, hungry, overstimulated brain makes an already difficult job significantly harder.

Give your brain the right kind of stimulation

There's another side to regulation that doesn't get talked about enough. People with ADHD don't only struggle with too much stimulation – we can struggle with too little as well. When something feels boring, repetitive or unrewarding, getting our brain engaged can feel almost physically difficult.

A helpful way to think about this is NICU: Novel, Interesting, Challenging, Urgent. If you can't get yourself moving, can you introduce one of those ingredients? You could set a ten-minute timer and race it, take your laptop somewhere new, turn a boring task into a challenge, put on some music, or body double with someone.

The idea is to find a way to make the task slightly more interesting to your brain, rather than repeatedly telling yourself you should be able to do it.

You don't need to avoid everything that dysregulates you

Regulation doesn't mean constructing a life where nothing ever feels uncomfortable. We actually build capacity by experiencing manageable amounts of challenge and discovering that we can cope with them.

The key word is manageable: one difficult conversation, not six; ten minutes starting the task, rather than demanding three hours of perfect concentration; sitting with an uncomfortable feeling for a moment before automatically reaching for your phone. Small experiences of "I can handle this" gradually build trust between you and your nervous system.

Your sensitivity isn't the whole story

If you've spent years being told you're dramatic, lazy, difficult or too sensitive, it's very easy to make those descriptions part of your identity. But behaviour makes much more sense when we look at what's happening underneath it.

So, rather than simply asking "Why did I react like that?", try asking "What had already filled my capacity before that happened?" That question creates space for curiosity instead of judgement.

Because sometimes the thing that made you cry wasn't really the email. The thing that made you snap wasn't really the cupboard. And the reason you're lying on the sofa unable to move isn't that you've suddenly become lazy – your brain and nervous system may simply have reached capacity.

Learning to recognise that earlier can change the way you respond to yourself. Over time, instead of constantly forcing yourself to cope with more, you can start building a life that works with your brain rather than against it.

A few questions to ask yourself this week

The next time you notice yourself becoming overwhelmed, try asking:

• What has my brain already had to deal with today?
• Have I eaten, slept, moved and had enough water?
• Am I overstimulated or understimulated?
• What does 70% overwhelmed feel like in my body?
• What could reduce the load by just 10% right now?
• Do I need stimulation, regulation or rest?

You don't have to fix everything. Sometimes you just need to notice what your brain is asking for a little earlier.

Finding support

If you're reading this and thinking "this explains so much", you don't have to figure it all out on your own. Talking to your GP, connecting with an ADHD support group or community, or working with an ADHD coach can all help you understand what's happening underneath the overwhelm, procrastination, emotional reactions and burnout.

Understanding your ADHD isn't about becoming better at forcing yourself through life. It's about learning how your brain works and finding strategies that work with it.