The truth is, says Jessica Myszak, a licensed psychologist with The Help and Healing Center, “the cause of ADHD in an individual, like many other health conditions, cannot be clearly identified.” In other words, “you do not develop ADHD,” explains Amy Marschall, a licensed clinical psychologist. “The neurological differences appear to be something you’re born with.” It’s these neurological differences that predispose you to ADHD and its symptoms.