They may have trouble prioritizing tasks, have low self-esteem, have trouble completing tasks, have many tasks going on at once, procrastinate and have a plethora of other problems. They also tend to be very creative and intelligent. ADHD has been misunderstood and misdiagnosed because of the variety of symptoms that can be present. Each person deals with ADHD a little differently and has overcome their problems with attention, impuslivity and hyperactivity in a different way. This is not a hard and fast rule though.
Girls can be hyperactive and boys can be inattentive.
Some people are diagnosed with yet a third type called Combined type because they show inattentive, hyperactive and impulsive symptoms. Some researchers think that since the ADHD brain has less internal stimulation, it seeks external stimulation. This results in either hyperactive or impulsive behavior or in shifts of attention from one thing to another. One might think the best treatment for hyperactivity would be a tranquilizer of some sort to slow the person down. However, treatment for ADHD usually involves the use of a stimulant medication that stimulates the brain s inner activity.