I T IS “LIKE being inside a pinball machine with a hundred balls,” says Lucy. “Three inner monologues,” says Phillip. “Like several tracks playing at the same time,” says Sarah. This is how people with attention-deficit hyperactivity disorder (ADHD) describe what is going on in their heads at any given moment. With so many thoughts jostling for attention, it is a struggle to concentrate. Appointments fly by. Relationships founder. Feelings of inadequacy—alongside anxiety and depression—start to creep in.