Yes it can be. I have ADD my self as well as dyslexia, and I know that when you are ADD your mind is thinking all the time. Sometimes what your mind thinks aren't always good things. Like for example, if you were picked on at school your mind will be constanly be thinking about that which can lead up to enxiety; and your mind can overlap thoughts with with other thoughts wether or not they are borth godd or bad.