You forget appointments. It's impossible for you to get organized. You start a project—then another and another—without any one of them getting done. You can't remember what you've just read, because your mind is wandering. We all have our "moments." We might write them off to multitasking, age, anxiety or mood disorders. But if these moments occur more than just once in a while, and there's a pattern to them, you may have attention deficit hyperactivity disorder, or ADHD—especially if these behaviors affect your self-esteem, productivity, relationships and the quality of your everyday life.