People with ADHD have real difficulties that make it hard to control focus (and hyperfocus). It’s not a matter of willpower or laziness.
Trouble with focus and other ADHD symptoms are caused by differences in how the brain develops. Studies have also shown differences in how structures in the brain work together.
These differences make it harder for people with ADHD to work on a task unless they’re very interested in it.
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ADHD and the brain