One day a coworker told me he went to the doctor because of his bad memory and they were suspecting ADHD. This person is extremely well organized and methodic about every thing, the one person who was always the most likely to be paying full attention on meetings and that sort of stuff. Everything about him screamed the opposite of ADHD. And the doctor was suspecting ADHD because he forgets things and that's an ADHD symptom.

Me, on the other hand, I clearly have problems that resemble being forgetful, but I know that's not what's going on. I just need my memories to be triggered. If I'm going to the store and you ask me to bring you some coke, I'll forget about it immediatelly and won't think about it again, but if I walk past the sodas and see the coke brand, or if I do a mental check "did someone ask me to bring anything?", then I'll remember it. It's very different from just being forgetful.

(tbh the mental check sometimes will just make me remember that someone did ask me for something, but not make me remember what it was)