Why are ADD and ADHD considered a learning disability?

ADHD- Primarily . Hyperactive/Impulsive Type, Primarily Inattentive Type & Combined Type impact academics, peer interaction &/or behavior < age 10. Because attention & memory interface, all types of ADHD impact learning & co-exist with Specific Learning Disorders in Reading, Written Expression & Math ~ 30-35% of the time, but are a different neurodevelopmental disorder than Learning Disorders. See CHADD.org.
They are not. Lack of the ability to focus or complete tasks is not a learning disability.It is a variation in how the nervous system responds to stimuli. They often co-exist (30% or so) with true learning disabilities.It is easy to be confused by the overlap in treatment and special attention, but it is not a learning disability.