Ron Davis, in his book The Gift of Learning said, and I quote "that all the symptoms of dyslexia were actually all the symptoms of disorientation. When a dyslexic individual is sufficiently confused, he will disorient spontaneously without noticing it.
But this is not the case with ADD, math and dysgraphic handwriting problems. For them, the effects of disorientation occur during early childhood development, long before a child is old enough to go to school.
During childhood development, both the person's natural state of orientation and the mental function of disorientation, working together, distort some children's perception of their environment to the degree that they develop an alternate reality or concept of essential life lessons, such as change, consequence, cause and effect, time and so on.
The establishment of these alternative realities can lead to the development of ADD, and to some extent, problems with math and handwriting."
Here is a mother's experience in dealing with her son's ADHD.