Sensory Overload in ADHD: Why It Happens and What Helps

I am sitting in a crowded café and I cannot understand what the person across from me is saying.

The voice actually comes through quite clearly. The problem is this: the conversation at the table behind, the noise of the coffee machine and the bell on the door come through with exactly the same clarity. All of them are at the same volume, and nothing is working to decide which one to listen to.

For years I wrote this down to myself as a flaw. "I can't focus," I said, "I don't like crowds," I said. Learning its name came after the diagnosis: sensory overload.

What it is like

This condition, brushed off for a long time as "over-sensitivity," takes up more and more space in adult ADHD research. The study by Bijlenga and colleagues (2017) shows that atypical sensory profiles are common in adult ADHD independently of autistic symptoms.

Its everyday form looks like this:

• Labels, seams, tight belts. Once you notice, you notice all day. I remember the day I cut the label out of a shirt and felt relieved, and the size of that relief surprised me.
• The hum of the fridge. Nobody hears it, and you want to leave the room.
• Fluorescent light. What is taken for tiredness is sometimes the lamp on the ceiling.
• Two people talking at the same time. You hear both, you understand neither.
• Smells. Perfume, cleaning products, the kitchen. It can go as far as nausea.
• Being touched. An unexpected touch makes you jump when you are not prepared.

Why it happens

The simplest explanation is this: part of the brain's job is to put incoming stimuli in order of importance. It decides which sound is background and which needs attention. Part of what stumbles in ADHD among the executive functions is this sorting work.

When the filter does not work well, everything comes to the foreground. This is tiring, because you have to do the sorting consciously. For me, keeping up a conversation in a crowded environment means doing two jobs at once: listening, and eliminating what I should not be listening to. The second is invisible, but it is the one that wears me out.

There is a second layer. In ADHD the arousal level can run unbalanced: sometimes you look for stimulus, and sometimes the same amount of stimulus feels unbearable. Both can happen in the same person in the same week, and this inconsistency can look to those around you as if you are putting on an act.

Overload usually looks like crankiness. From the inside it is noise; from the outside it is a difficult person.

Signs of overload

Recognizing your own signs in advance is the most practical part of this. The ones often described:

• Starting to shorten sentences, answering in a single word
• A sudden intolerance of being touched
• The feeling of "I need to get out of here"
• Hearing what is said without understanding it
• A wave of anger that seems to have no reason
• Small movements such as closing the eyes, lowering the head, frowning toward the sound

By the time these signs come, the matter has already gone far. My earliest sign is my sentences getting shorter; learning to notice this saved evenings.

What helps

Choosing the environment beforehand. Moving the meeting to a quiet place, setting the table in a corner, putting your back to the wall. It looks like a small preference and it changes the rest of the day. I now suggest the meeting place myself; in the years when I was ashamed to do this, I came home exhausted from every meeting.

Headphones. Noise-cancelling headphones or earplugs are the cheapest and most effective intervention in this area. You do not have to listen to music; silence itself is also an option.

Making clothing a non-issue. If you have found a fabric you are comfortable in, buying several of the same. Choosing clothes in the morning is also a decision; every decision you reduce is left to you.

Making an exit plan. Deciding when you will leave before going to a long invitation. Not feeling obliged to stay lengthens the time you can stay. This has worked for me countless times.

Taking a break early. Going outside for ten minutes is cheaper than trying to pull yourself together two hours later. Even going to the toilet works: quiet, small and nobody questions it.

Building a separate strategy for the open office. A constantly noisy work environment is the hardest form of this; I dealt with it separately in the article on ADHD and the open office.

Building your own environment at home

You cannot always choose the workplace. You can choose the home, and that is the place with the most return.

Splitting the light. Several small light sources instead of a single overhead lamp. I never turn on the ceiling lamp in the evenings, and the effect of this on the end of the day is clear.

Reducing the source of sound. Moving a constantly running device, closing the door, putting down a rug. Not hearing a hum is easier than trying to get used to it.

A quiet corner. It is enough for one place in the house to be quiet and plain. When I tried to simplify everywhere I failed; protecting one corner was possible.

A moment of unloading at the entrance. As soon as you come home, putting down the coat, the shoes, the phone and doing nothing for two minutes. A simple transition so as not to carry the load from outside into the house.

None of these is a big investment and all of them are done once. That is the nice side of reducing sensory load: most solutions are set up once and work for months.

Recovery time after overload is real. Not putting heavy work on the day after a hard day looks like a luxury; it is actually maintenance. This is called recovery time, and it needs a place in the calendar. For me it means leaving the morning after a crowded event empty.

Its relation to autism

For a long time sensory sensitivity was associated only with autism. The picture today is more mixed: ADHD and autism often occur together, and sensory profiles can be atypical in both (Antshel & Russo, 2019). The international consensus statement also emphasizes how common this co-occurrence is (Faraone et al., 2021). I described the picture in which the two are together in the article on AuDHD.

So experiencing sensory overload does not by itself prove one thing. The importance of this is here: whichever diagnosis it is, the solutions come largely from the same place, from arranging the environment. But understanding the picture correctly affects treatment decisions, so it makes sense to talk to a specialist who considers both.

What changed after I learned this

The biggest change was my story about myself.

Before, when I left a crowd early I would think "I failed again." Now I think "the load was full," and these two produce completely different evenings.

The second change is being able to ask for things. For years, saying "can we sit over there" felt like too much of a demand. Yet for the other person it costs zero, and for me it is a whole day.

The same logic applies in the article on emotion regulation: reducing the load that comes from outside takes far less energy than trying to suppress the reaction inside. I dealt with the exhaustion side of social settings in the article on the social battery.