The National Institute of Mental Health (NIMH) states that attention deficit hyperactivity disorder (ADHD) is a common disorder during childhood, though symptoms can extend well into adulthood. Three to 5 percent of school-aged children are diagnosed with ADHD, with the majority displaying symptoms by age 7, according to the National Institutes of Health (NIH). The symptoms a patient has depends on the subtype he is diagnosed with; the subtypes include predominantly hyperactive-impulsive, predominantly inattentive and combined hyperactive-impulsive and inattentive.
Hyperactivity Symptoms
The Mayo Clinic states that boys with ADHD are more likely to be hyperactive and have problems staying still. They may constantly move their hands and feet and squirm in their seats. Male patients also have more noticeable hyperactive behaviors, such as getting out of their seat during class. A patient may also talk excessively, be constantly in motion and have trouble playing quietly. Other symptoms include running or climbing at inappropriate times and touching or playing with anything in sight.
Inattention Symptoms
The Mayo Clinic adds that although boys with ADHD are more hyperactive, girls with the disorder are more likely to be inattentive and caught up in daydreaming. The inattention symptoms can affect the child's performance in school, as the patient is easily distracted, has problems remembering information and cannot process information as well as other children. The child has difficulty following directions and completing tasks and can switch from activity to activity. Other inattention symptoms include getting bored quickly, losing items, making careless mistakes and struggling with organization. Because of her symptoms, the child may try to avoid activities that require mental effort, such as her homework.
Impulsive Behavior Symptoms
Impulsive behavior in ADHD is often linked with hyperactivity. For example, if a child is impatient and has difficulty waiting for his turn, he may be more likely to fidget in his seat. The child may also interrupt other people and have problems with emotional restraint. Another impulsive behavior found in ADHD patients is blurting out inappropriate comments.
