To be diagnosed with attention deficit/hyperactivity disorder, a person must visit a licensed medical practitioner. According to WebMD, symptoms of ADHD include inattentiveness and/or hyperactivity, and impulsive behavior may also be present. ADHD is often diagnosed in children who display these symptoms to a far greater degree than their peers. Adults who are diagnosed with ADHD may have symptoms slightly different from children, such as restlessness instead of hyperactivity.
WebMD states that there are three distinct types of ADHD: inattentive ADHD, hyperactive-impulsive ADHD and combined ADHD. Inattentive ADHD involves having symptoms of inattentiveness without hyperactivity or impulsiveness, hyperactive-impulsive ADHD involves having symptoms of hyperactivity or impulsiveness without inattentiveness and combined ADHD involves a mixture of the inattentiveness and hyperactivity/impulsiveness.
Symptoms of inattentiveness include inability to sustain attention on tasks or activities, difficulty paying attention to details, distractibility and difficulty finishing schoolwork or paperwork, states WebMD. Additional symptoms of inattentiveness are frequent shifts from one uncompleted task to another, procrastination, disorganization, forgetfulness, failure to complete tasks, frequent shifts in conversation and not listening to others. Symptoms of hyperactive-impulsive behavior include fidgeting and squirming when seated, getting up frequently to walk or run around, talking excessively, having difficulty talking quietly, having difficulty partaking in leisurely activities and running or climbing at inappropriate times. For an ADHD diagnosis to be made, these symptoms must be outside of the normal realm of other peers' behaviors.