ADHD causes people to have problems paying attention to routine or boring tasks, or to stay focused on a task long enough to finish the task, especially if the task is not very interesting. The person might be able to focus on interesting projects or entertainment such as video games for long periods of time, but it is the boring tasks of life that are very difficult.
Often ADHD causes a lack of self-control. Impulsive behaviors or choices can cause havoc in relationships, work, school, or life. Saying things, or doing things without thinking first is a pretty classic symptom of Attention Deficit Hyperactivity Disorder in both children and adults.
About half of those with ADHD are "bouncy" like Tigger, hyperactive, always "on the go," and restless. The standard line is that they act as if they are "driven by a motor." Another good description is "excessive, non-goal directed, motor activity."
Easily Bored -
Unless the task is very stimulating, like a video game or TV program or outside playing, those with Attention Deficit Hyperactivity Disorder are often easily bored by a task - especially bored by homework, math tests, balancing checkbooks, or doing taxes, and many of these tasks just never get done.