ADHD forgetfulness: why it happens and how to stop forgetting things

I built Ormy, a reminder app, so I'm not neutral. I have ADHD, but I'm not a doctor. This is what the research says and what has worked for me, not medical advice. If something here is wrong, email me and I'll fix it.

Is forgetfulness a sign of ADHD?

Yes. The NHS lists "being easily distracted or forgetful" and "losing things often, like your wallet, mobile or keys" among the signs of ADHD in adults.

For a lot of us, that looks like:

• Missing an appointment you definitely knew about
• Remembering a birthday the day after
• Paying a bill late, with the money sitting there
• Forgetting what someone told you five minutes ago
• Losing your keys, phone or wallet, again

Everyone forgets things sometimes. With ADHD it happens all the time, and it gets in the way of your life. Forgetting things doesn't prove you have ADHD, though. Only a doctor can diagnose it.

Why does ADHD make you so forgetful?

It isn't that your memory is broken. The research points to three things.

1. Your working memory is weaker. Working memory is your brain's sticky note. It holds a thought for a few seconds while you use it. A review of 38 studies found that adults with ADHD do worse on working memory tests, on average. It isn't something you just grow out of. So "I need to text Mum back" can be gone before you've picked up your phone.

2. Things don't go in properly. Another review looked at why adults with ADHD do worse on some memory tests. It found the problem is mostly getting information in, not getting it back out. That fits everyday life: if your mind was elsewhere when you put your keys down, there's nothing to remember.

3. Remembering to do something later is different again. Psychologists call it prospective memory. In one study, adults with ADHD were much worse at remembering to do something at a set time. But when the task was tied to something happening in front of them, they did no worse than anyone else. It was a small study, so don't read too much into it. But it matches what a lot of us live with: "at 3pm" slips, "when I see the bin bag" works.

Could it be something else?

Yes. The NHS says memory problems can be caused by things that are common and treatable, like stress, anxiety or depression, and sleep problems. Tired, stressed brains forget more, ADHD or not.

The NHS says to see a GP if memory problems are affecting your day-to-day life. Go sooner if it's new, or getting worse.

How do you stop forgetting things with ADHD?

You can't make your working memory reliable by trying harder. ADHD researcher Russell Barkley says the help has to be at the "point of performance": the place and time where you need to act. His word for it is "externalize": making the information physical, outside your head.

Here's what that looks like day to day.

1. Get it out of your head straight away. The second you think "I need to…", write it down or tell your phone. Don't wait until you've finished what you're doing. By then it's gone.
2. Keep it all in one place. If your reminders are spread across three apps and a notebook, you have to remember where you put them.
3. Put the reminder where you'll act on it. Keep your tablets next to your toothbrush. Hang the bin bag on the door handle. Put the parcel you need to post in front of the door, where you'll trip over it. A phone reminder tied to a place does the same job: it goes off when you get there.
4. Tie it to something that happens, not just a time. "When I put the kettle on, I'll take my tablets." Psychologists call these if-then plans. A review of 36 comparisons found they help people remember to do things later. (Those studies weren't in people with ADHD, so it isn't proven for us. But it's free to try.)
5. Use reminders you can't just swipe away. A normal reminder goes off once. Swipe it away "for a second" and it's gone, along with the task. For anything important, use a reminder that keeps going until you've done it, or an alarm.
6. Get warned early for big dates. A birthday reminder on the day is too late to buy a card. Set warnings a week or two before, then again closer to the day.
7. Give the things you lose a home. One bowl or hook by the door for your keys and wallet, every time. A tracker tag on your keys helps too.

Why did I build Ormy?

I kept forgetting the things I cared about most. Birthdays. Appointments. I'd know something important was coming up, and still not remember it until it was too late. Every reminder I set, I could swipe away.

Kyle Ormesher, founder

So I built Ormy. It's a reminder app, not a planner. You tell it once, and it comes to you.

• It reminds you until it's done. Ormy nudges you every few minutes, for up to an hour, until you tick it off.
• Still ignoring it? It rings. For the things that really can't slip, Ormy can ring a real alarm, even on silent or in a Focus. (Needs iOS 26 or later.)
• It reminds you where, not just when. Tie a reminder to a place, and it waits until you're actually there.
• Big dates get warnings first. A birthday gets warnings from two weeks out, so there's time to buy the card.

Ormy is iPhone only, and coming soon. But you don't need it for the tips above. Most of them work with any app, or a pen and paper.

Questions people ask

Is forgetfulness a symptom of ADHD? Yes. The NHS lists being forgetful, and losing things like your wallet, mobile or keys, among the signs of ADHD in adults. But forgetting things on its own doesn't mean you have ADHD. Only a doctor can diagnose it.

Why do I forget things the second I think of them? That's working memory, your brain's short-term sticky note. Research shows it's weaker, on average, in adults with ADHD. Write the thought down or tell your phone straight away, before you do anything else.

Does ADHD cause memory loss? Not in the way most people mean. Research suggests ADHD mostly affects getting things into your memory, not losing what's already there. If your memory has got worse, or it's affecting your day-to-day life, see your GP.

How can I remember things better with ADHD? Get things out of your head the moment you think of them. Put reminders where you'll act on them, and tie tasks to things you already do, like "when I put the kettle on, I'll take my tablets". For anything important, use a reminder that keeps going until it's done.

What's the best app for ADHD forgetfulness? The one you'll actually use. A planner helps if organising your day is the problem. If you plan and still forget, you need reminders you can't swipe away. I compared the main ones in the best ADHD reminder apps.

How do I stop forgetting birthdays? Add each birthday once, with warnings a week or two before, not just on the day. That gives you time to sort a card or a present. Ormy does this for you: it starts warning you two weeks out.