ADD

An inability to control behavior due to difficulty in processing neural stimuli.

ADHD

Attention deficit hyperactivity disorder (ADHD) is one of the most common childhood disorders and can continue through adolescence and adulthood.

Symptoms include difficulty staying focused and paying attention, difficulty controlling behavior, and hyperactivity (over-activity).

Inattention, hyperactivity, and impulsivity are the key behaviors of ADHD.