What Causes ADHD?

Science hasn't firmly established root causes for AD/HD but it appears to be strongly genetic. There is no genetic marker or biological test for it—yet. What is known is that AD/HD is the creation of many, many genes involved in ways still unknown to researchers, and that AD/HD inconsistent from person to person.
Lastly, environment impacts gene expression (Hallowell & Ratey, 2005).

Many gifted individuals have used the perception of adversity to their advantage and once they tapped into their unique gifts and talents they changed the world,
literally. Dexter Scott King, son of civil rights leader Dr. Martin Luther King, Jr., who is President and CEO of The King Center in Atlanta, Georgia. His
memoir, Growing Up King, was published in 2003. Similarly, Erin
Brockovich, who inspired a movie of the same name, serves as the Director of
Environmental Research at the law offices of Masry & Vititoe.