Because, for an individual to be diagnosed with ADHD, this has to cause a clear maladaptation. Which is often defined by it causing them distress. A person who has simply a high optimum arousal threshold, but operates perfectly fine on a cup of coffee is one thing. A person who has a high optimum arousal threshold and cannot focus on his schoolwork so he starts to fail is another. One is perfectly fine. The other can be a bar to a decent education.
Since I had always assumed that I outgrew my 'hyper-active' phase I don't know how to properly answer your question.
In my case, I enjoy 'stressfull' situations as they give me a chance to 'prove my ability to meet the needs' of any problem that life throws my way. You needn't play martial music or hype me up on stimulants. Just make the problem personal and difficult and I'm on it like ugly on an Englishman :wink:. I LIKE problems thrown my way as they mostly prove myself against them. Coasting through life without testing yourself is boring. Surpassing roadblocks in life gives you a 'benchmark' to show the passing of time and your accomplishments. As you get older, the saying "time flies" gains more and more relevance as you become jaded and gain less benchmarks to show the actual passing of time. It is my opinion that we, as humans, need noteworthy events to benchmark time and without those, we simply coast through time toward oblivion. To the young, most of life's experiences are interesting ( providing benchmarks ). To those that grow older, the noteworthy benchmarks become fewer and fewer ( the marriage of our kids, the birth of grandkids, change in a job, et cet ) and time moves faster because we have fewer means to benchmark the passage of years.
It is my assumption that this is why I deliberately place myself in 'risky' situations. Working with high voltages ( 480 VAC 3 PH ), playing with high pressure or explosive gases, rock climbing, stuff that can kill you in general. I'm not looking for a rush ( I don't even get worked up until after I've successfully completed my work, if at all ) but rather an excuse to remind myself that I was sufficient to the needs placed before me.
Don't know if that helped or not but it gained me another post count ( well actually, being in Off Topic, I guess it didn't :wink: ).
Hah! You sound like me!