Why Can I Do Really Difficult Things… But Not Really Simple Ones? The Inconsistency of ADHD
Updated: Sep 14
Ever wondered why you can manage incredibly complicated things but somehow cannot reply to one email? ADHD can involve significant variability in attention, motivation and task initiation. Here's why “I can do it sometimes” doesn't mean it should always be easy.
You can manage a crisis.
Complete a degree.
Run a business.
Look after other people.
Become ridiculously knowledgeable about a subject you discovered three days ago.
Pull together an entire piece of work under intense pressure with approximately twelve minutes to spare.
But reply to the email?
No.
Put the washing away?
Apparently impossible.
Make the phone call you've been thinking about every day for three weeks?
Absolutely not.
This is one of the things I find both fascinating and, as someone with ADHD myself, occasionally deeply irritating about ADHD.
Because ADHD can be incredibly inconsistent.
And when you don't understand why, that inconsistency can easily become:
“I'm obviously just lazy.”
“If I can do all of those other things, why can't I make myself do this?”
“I clearly could do it if I tried hard enough.”
But ADHD isn't simply a problem of knowing what to do.
Quite often, it's a problem of being able to activate yourself to do it.
ADHD isn't an inability to pay attention
This is probably one of the biggest misconceptions about ADHD.
People with ADHD can concentrate.
Sometimes we can concentrate spectacularly.
Give me something interesting, complex, urgent or personally meaningful and my brain may be fully on board.
Give me a repetitive administrative task with no immediate consequence and suddenly we appear to have lost contact with mission control.
This is because ADHD is better understood as involving difficulties with the regulation of attention and executive functioning, rather than simply a lack of attention.
The important word there is regulation.
It's not necessarily:
“I cannot focus.”
It's:
“I cannot always reliably choose what my brain focuses on, when it focuses on it, or how long that focus lasts.”
And that is a very different problem.
“But you can focus for hours on things you enjoy”
Correct.
Thank you for noticing.
Unfortunately, this does not disprove ADHD.
In fact, it can be part of it.
People with ADHD can experience periods of very intense concentration, sometimes described as hyperfocus, particularly when something is interesting, novel, challenging or rewarding.
You might completely lose track of time.
Forget to eat.
Ignore messages.
Continue long after you intended to stop.
Become extraordinarily productive.
Which sounds fantastic.
Until you realise you've spent four hours researching something you had absolutely no intention of researching while the thing you actually needed to do remains untouched.
ADHD attention isn't necessarily absent.
Sometimes there is far too much of it.
It's just attached itself to the wrong thing.
Why can boring tasks feel so disproportionately difficult?
Imagine two tasks.
Task one is complicated, interesting and challenging.
Task two involves calling the dentist.
Logically, task one should require more effort.
Your ADHD brain may disagree.
Task initiation relies on executive functioning: the cognitive processes that help us organise, prioritise, begin, sustain and shift between activities.
When those systems aren't activating efficiently, a task can feel strangely difficult to start even when it is objectively 'simple'.
And this is where other people can become confused.
“It'll only take five minutes.”
We know.
That's partly why it's so annoying.
The difficulty isn't necessarily the five minutes required to complete the task.
The difficulty is getting the brain into the starting position.
Sometimes we wait for urgency to do the activating for us
If you've ever spent three weeks avoiding something and then completed it at extraordinary speed shortly before the deadline, you'll know this one.
The task hasn't suddenly become easier.
It has become urgent.
And urgency can provide exactly the stimulation your brain was previously struggling to generate.
Suddenly there is focus.
Energy.
Clarity.
Momentum.
You do the thing.
And because you managed to do it, you promise yourself:
Next time I'm definitely going to start earlier.
Narrator: she did not start earlier.
The problem is that this cycle can actually reinforce itself.
If you've repeatedly discovered that panic eventually gets the job done, your brain learns that waiting for urgency works.
It works at a cost, of course.
Stress.
Late nights.
Adrenaline.
Self-criticism.
The occasional frantic submission at 11:58pm.
But technically, the task got finished.
Motivation can work differently with ADHD
We're often taught to think about motivation as something quite straightforward.
Something is important → therefore you do it.
But with ADHD brains, knowing something is important may not be enough to generate action.
Things such as interest, novelty, challenge, urgency and immediate reward can have a much stronger influence on engagement.
This can create some very confusing situations.
You desperately want to complete something.
You understand exactly why it matters.
You may even be anxious because you aren't doing it.
And yet...
You're still not doing it.
That experience can be incredibly difficult to explain to someone who hasn't experienced it.
Because from the outside, it looks like a choice.
From the inside, it can feel like standing in front of an invisible wall.
Then comes the shame
This is the part I think we talk about less.
When you repeatedly fail to do things you genuinely intended to do, you start developing explanations for why.
And without an understanding of ADHD, those explanations can become very personal.
Lazy.
Undisciplined.
Unreliable.
Disorganised.
Not trying hard enough.
Wasting your potential.
And because ADHD is inconsistent, you have evidence to use against yourself.
“I managed that incredibly difficult thing last week, so clearly I could do this if I actually wanted to.”
But ability isn't the same as consistent access to that ability.
That's a really important distinction.
Executive dysfunction can look like procrastination
Sometimes it is procrastination.
But sometimes there's more happening underneath.
You may not know where to begin.
The task may contain too many steps.
It may feel vague.
There may be several equally important priorities competing for attention.
You may be worried about doing it incorrectly.
The reward may feel too distant.
Or the task may simply provide so little stimulation that initiating it feels disproportionately difficult.
This is why telling someone with ADHD to “just do it” tends to have limited therapeutic value.
They've probably already told themselves that 63 times.
Make the task easier to start, not harder to avoid
One of the most useful things I've learnt about my own ADHD is to stop relying exclusively on motivation.
If my brain isn't naturally activating for something, I can change the environment around the task.
That might mean:
Making the first step ridiculously small.
Doing something alongside another person.
Using a timer.
Creating an artificial deadline.
Adding music or movement.
Doing the boring task alongside something more stimulating.
Putting the thing I need to do directly in my line of sight.
Breaking vague tasks into concrete actions.
Giving myself an immediate reward rather than relying on the distant satisfaction of having completed it.
Instead of:
“Sort my finances.”
Try:
“Open the banking app.”
Instead of:
“Clean the house.”
Try:
“Put the mugs in the dishwasher.”
Sometimes once the brain starts, momentum follows.
Not always.
But getting over the activation hurdle can be half the battle.
This is also why ADHD can be missed in adults
If somebody is intelligent, driven, interested in their work or has developed effective coping strategies, they may achieve an enormous amount.
That doesn't necessarily mean executive functioning is easy.
In fact, some of the adults I meet during ADHD assessments have extremely successful careers alongside surprisingly significant difficulties with everyday tasks.
They can manage enormous professional responsibilities and then forget to pay a bill.
Lead a meeting and lose their keys.
Support everyone else and struggle to organise their own life.
This isn't contradictory.
It's exactly why we need to understand ADHD in context rather than asking:
“Can this person function?”
A much better question is:
“Under what conditions can this person function well, and what happens when those conditions aren't present?”
Personally, understanding this has helped enormously
Having ADHD myself means I recognise this inconsistency very well.
There are things I can do that require enormous amounts of concentration and responsibility.
There are also considerably smaller tasks my brain will apparently treat as though I've asked it to climb Everest wearing flip-flops.
Understanding ADHD hasn't magically removed that.
What it has changed is the way I respond to it.
Instead of spending quite as much time thinking:
“This is ridiculous. Just do it.”
I can ask:
“What is making this difficult to start, and how can I make the starting point easier?”
Sometimes the answer is still:
“I have absolutely no idea.”
We're aiming for progress, not perfection.
You aren't supposed to function at exactly the same level every day
Human beings aren't machines.
And ADHD brains can be particularly sensitive to context.
Sleep, stress, interest, hormones, sensory load, emotional state, environment and the amount of cognitive demand you're already carrying can all influence how accessible your executive functioning feels.
So yes.
You might be able to do something easily one day and struggle enormously with exactly the same thing the next.
That doesn't mean yesterday's success proves today's difficulty isn't real.
It means functioning is variable.
Understanding that variability allows us to build strategies around how a person actually functions, rather than how we think they should function.
And that tends to be far more useful.
Wondering Whether ADHD Might Explain Some of Your Experiences?
Difficulty initiating tasks, inconsistent attention, procrastination, time management, working memory and becoming intensely focused on particular interests can all form part of ADHD.
But relating to individual experiences doesn't necessarily mean you have ADHD.
A comprehensive assessment considers your current experiences alongside your developmental history, functioning across different areas of life, strengths, difficulties and the strategies you may have developed over time.
At I.N. Therapy Berkshire, we provide comprehensive, neuroaffirming ADHD and combined autism and ADHD assessments for adults.
We also offer focused neurodivergence support for adults who want to better understand how their brain works and develop practical strategies that fit their individual needs.
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