There are probably completely different “problems” in the brain whose results are all classified as ADHD. Some people with are “inattentive” ADD, others are “hyper-attentive” ADHD.
There are also various levels of ADHD. I think everyone has some level of “ADHD”: everyone can understand having trouble starting tasks or forgetting things. These are the symptoms of ADHD. But people diagnosed have them much more severe (sometimes to a flat-out “how?” extent). Some people with ADHD can get by with mental techniques and planners, others really need medication.
e.g. having trouble getting up (normal) vs spending hours in bed not realizing any time passed (ADD). Not being able to focus for long (normal) vs losing focus literally every 5 seconds and getting distracted by anything (ADHD).
There are probably completely different “problems” in the brain whose results are all classified as ADHD. Some people with are “inattentive” ADD, others are “hyper-attentive” ADHD.
There are also various levels of ADHD. I think everyone has some level of “ADHD”: everyone can understand having trouble starting tasks or forgetting things. These are the symptoms of ADHD. But people diagnosed have them much more severe (sometimes to a flat-out “how?” extent). Some people with ADHD can get by with mental techniques and planners, others really need medication.
e.g. having trouble getting up (normal) vs spending hours in bed not realizing any time passed (ADD). Not being able to focus for long (normal) vs losing focus literally every 5 seconds and getting distracted by anything (ADHD).