Do you find it hard to concentrate? Do you have periods of prolonged restlessness? Do you know someone who might exhibit these symptoms? ADHD, attention deficit hyperactivity disorder, is one of the most common neurobehavioral disorders of childhood, according the Center for Disease Control, CDC.
ADHD can be common in childhood. According to the Mayo Clinic staff ADHD may not diagnosed until later in life. Some adult symptoms may include unstable relationships, poor work or school performance and low self-esteem.