It's a perfectly fine analogy. They're both problems which are problems because of our society.

You're suggesting physical illness is more "real" than mental illness.

>We're demanding kids do something that makes them unhappy, and any reaction to it, is labeled a disease.

It's far more than kids not being able to pay attention in class. ADHD affects many aspects of a person's life—and adults too. Living independently with unmedicated ADHD can be incredibly difficult. Everything from social life, working, to driving, is harder/riskier.

The argument against treating ADHD is based on unfounded fears of psychiatry and medication. "What if this, what if that". Well this and that isn't happening, peoples lives are being improved, and people are suffering because of dangerous FUD like this.