They often lose things such as money or keys to their house. They may forget to bring their bookbag or their lunch to school. Their desks at school and at home are often messy. After awhile, it hurts to hear these things all of the time. Not every kid who has ADHD is hyper.
Some kids only have trouble paying attention and staying organized.
They do not have trouble sitting still or being too active. We do not know for sure. Some people are born with it. If you have ADHD, chances are that at least one of your parents, brothers, sisters, or other close relatives has some of the same problems. Others may get ADHD later, though the problems usually show up by age 7.