The causes of ADHD are not known. However, it appears that heredity plays a major role in the development of ADHD. Children with an ADHD parent or sibling are more likely to develop the disorder themselves. Before birth, ADHD children may have been exposed to poor maternal nutrition, viral infections, or maternal substance abuse. In early childhood, exposure to lead or other toxins can cause ADHD-like symptoms. Traumatic brain injury or neurological disorders may also trigger ADHD symptoms. Although the exact cause of ADHD is not known, an imbalance of certain neurotransmitters (the chemicals in the brain that transmit messages between nerve cells) is believed to be the mechanism behind ADHD symptoms.
The diagnosis of ADHD requires the presence of at least six of the following symptoms of inattention, or six or more symptoms of hyperactivity and impulsivity combined:
fails to pay close attention to detail or makes careless mistakes in schoolwork or other activities has difficulty sustaining attention in tasks or activities does not appear to listen when spoken to does not follow through on instructions and does not finish tasks has difficulty organizing tasks and activities avoids or dislikes tasks that require sustained mental effort (such as homework)
is easily distracted is forgetful in daily activities
fidgets with hands or feet or squirms in seat does not remain seated when expected to runs or climbs excessively when inappropriate (in adolescents and adults, feelings of restlessness)
has difficulty playing quietly is constantly on the move talks excessively
blurts out answers before the question has been completed has difficulty waiting for his or her turn interrupts and/or intrudes on others
Further criteria to establish a diagnosis also require that some symptoms develop before age seven, and that they significantly impair functioning in two or more settings (home and school, for example) for a period of at least six months.
Many individuals with ADHD have symptoms from all three of the above categories. Some children, however, have behavior patterns in which inattention dominates, or hyperactivity and impulsivity dominate. For this reason, ADHD can be further categorized, or subdivided, into three subtypes. Children who have at least six symptoms from both of the inattention and hyperactivity-impulsivity categories above may be diagnosed with ADHD, combined type. Children who meet the symptom criteria for inattention, but not for hyperactivity/impul-sivity are diagnosed with attention-deficit/hyperactivity disorder, predominantly inattentive type, commonly called ADD. Children who experience more symptoms from the hyperactivity and impulsivity categories, but fewer than six symptoms of inattention may be diagnosed with ADHD, predominantly hyperactive-impulsive type.
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Attention Deficit Disorder or ADD is a very complicated, and time and again misinterpreted, disorder. Its beginning is physiological, but it can have a multitude of consequences that come alongside with it. That apart, what is the differentiation between ADHD and ADD ADHD is the abbreviated form of Attention Deficit Hyperactive Disorder, its major indications being noticeable hyperactivity and impulsivity.