human
I've been having trouble focusing at work. What are some of the most common causes of ADD?
assistant
1.  Stress and anxiety can cause a person to have difficulty concentrating, which is one of the symptoms of ADD.
2.  Caffeine can also be a stimulant that can lead to hyperactivity, which is another symptom of ADD.
3.  Too much sugar or caffeine in your diet can also contribute to ADD symptoms.