Human: I've been having trouble concentrating on my schoolwork lately. What are some of the most common causes of attention deficit disorder? Assistant: 
Some of the most common causes of ADHD include environmental factors, such as noise and distractions in the environment; biological factors, like genetics or brain chemistry; and psychological factors, like stress or anxiety. Other potential contributing factors to ADHD can be related to a person's upbringing, their social situation, and their learning style.