I just want to say that a lot of the surface level ADHD actions are common to humans who are alive. The reason for those things various dramatically and the frequency of occurrence is definitely an ADHD thing, but simply getting distracted while focusing on something is not exclusive to ADHD, but being unable to focus because of distractions (sometimes distractions that are completely mental and exclusive to your brain) is an ADHD thing.
It’s like, you’re probably not going to be able to do your tax return next to an active jackhammer regardless of who you are, but when you’re doing your taxes in a quiet room and you’re distracted by the HVAC turning on and making a humming noise, that’s probably ADHD.
Edit to add: I’m listening to someone in another room browse tiktok, I’m listening to the furnace hum and I can hear my stomach doing its digestion thing, yet I still maintained focus on this somehow. Medication works!