There is a pile of mail on your dining room table. It started with three letters. Then it was five. Now it is a chaotic, cascading mountain of 30 envelopes, catalogs, and final notices. Every single time you walk through the dining room, you intentionally avert your eyes. Just glancing at the pile causes a sharp, physical twinge of anxiety in your chest. You tell yourself, "I will sit down with a coffee this Saturday and sort through all of it."
Saturday comes and goes. The pile remains untouched. You are effectively holding yourself hostage in your own home.
To the neurotypical brain, mail is just paper. You open it, sort it, and throw the junk away. To the ADHD brain, mail is concentrated, physical friction. Opening a letter means unleashing an undefined multi-step chore into your fragile ecosystem. If it's a bill, you have to log in to a clunky website. If it's a form, you have to find a pen and mail it back. Your brain evaluates these potential 'next steps' and realizes it lacks the executive function required to complete them.
Therefore, the brain chooses ignorance. It assumes that if the letter remains unopened, the demand does not yet "exist." It is Schrödinger's Mail: until you open the envelope, you aren't officially in debt, and you don't officially have jury duty. The brain accepts a permanent state of low-level, toxic anxiety to avoid a 5-minute, high-friction confrontation.