There is also some overlap between ADHD and HFA, and the overlap and differences
can vary by source. My kid was originally diagnosed with ADHD, but a 8 years old was diagnosed with Asperger's Syndrome (now on the Autism spectrum). We have learned a lot since then.
ADHD and autism are the two most common neurodevelopmental disorders that start in childhood and persist into adulthood. However, they affect you differently.