There are many different ways to look at ADHD:
Some people deny that it exists. The fact that they have no idea what they are talking about does not deter them.
Some people say it is an executive dysfunction problem. I think that is one part of ADHD.
Some focus on the neurotransmitters (norepinephrine, dopamine), some on structure (basal ganglia, cerebellum), and some on networks (connecting amygdala, hippocampus, frontal cortex, cerebellum). I think it is all of these.
Some see it as a disease or disorder. Some see it as a variation of normal. Others see it as a gift. I am not one of those. I see it as a difference which, since it causes so many problems, is a disorder. I also believe there is an abrupt significant difference between us ADHDers and the vanillas, not just a gradual change on a curve.
Dr. William Dodson, an expert on ADHD who I highly respect, has a different view from mine, regarding the basic symptoms and dysfunctions:
I see ADHD is a neurodevelopmental disorder, highly genetic, present from conception, with differences in the networks, structures, and neurotransmitters. To me, the main issue is lack of control of focus, and that our “focus center” is not turned on in the same way as the vanillas. This basic feature causes a number of problems, which themselves cause other problems or symptoms, such as rejection sensitivity due to shame and low self-esteem, for example, which is caused by our frequent screwing up and the resulting criticism from others and from ourselves.