Attention Deficit Hyperactivity DisorderAttention Deficit Hyperactivity Disorder (ADHD) is very commonly known. Today, ADHD is one of the most common mental disorders among children. The NIMH (National Institute of Mental Health) predicts that it affects 3 to 5 percent of all children (AACAP), with approximately 30 to 65 percent of these children experiencing persistence of symptoms into adolescence and old age. adult (AACAP). There are three types of attention deficit hyperactivity disorder; Predominantly hyperactive-impulsive type, predominantly inattentive type, and combined type (ehow.com). ADHD symptoms can be classified into three main categories: hyperactivity, inattention, and impulsivity. These behaviors can interfere with the ability of people with ADHD to deliberately focus on organizing and completing a specific task that they do not enjoy. A case of this type of behavior is recognized in a report written by the National Institute of Mental Health in which one of the subjects studied was unable to take school exams due to his inattentive behavior (clinicaltrials.gov) . This type of behavior can harm mental health. the person's relationships with others in addition to disrupting their daily life, consuming energy and decreasing self-esteem, depending on the severity of their symptoms (adhd.com). In this article, multiple factors on how ADHD affects and is treated in those who suffer from this disorder are presented. Above all, the most important part to understand about this disorder is the symptoms the person is suffering from. One of the most common symptoms of this disorder is inattention. Inattention occurs when a person is careless and does not pay attention to a subject placed in front...... middle of paper ......=&state2=&cntry2=&state3=&cntry3=&locn=&gndr= &fund=0&rcv_s=&rcv_e=&lup_s=&lup_e=>."How common is ADHD." AACAP. AACAP, and Web. January 5, 2014. “Neurodevelopmental Disorders.” Family success. Family success, nd Web. January 5, 2014. “What is the definition of ADHD? ". Adult - Child - ADD - ADHD. N/A, and Web. January 5, 2014. .Dr.Khin (January 2013, 2014) community hospital. Personal interview/appointment for my ADHD “Attention Deficit/Hyperactivity Disorder (ADHD)”. Centers for Disease Control and Prevention-CDC. CDC and Web. January 5, 2014.ncbddd/adhd/treatment.html>.