ADHD symptoms cause problems in school and at home for children. Besides having difficulty sitting still to complete homework, they encounter academic difficulties that negatively affect their progress. They are prone to accidents such as falls. In university, they cannot submit their work on time, resulting in a delay in graduation.

Adults cannot complete the work before the deadline and make careless mistakes. Some patients' poor time management and frequent loss of important objects (such as wedding rings, etc.) affect relationships and married life. ADHD patients may be unable to concentrate when driving a car, which results in road traffic accidents. It is possible for adults with ADHD to make some impulsive and dangerous decisions (e.g., impulsively buying a very expensive object or impulsively making a very important life decision, etc.).