Iron Deficiency in adults causes lethargy, feeling exhausted and irritability. In infants and children, however, the symptoms include irritability, inability to concentrate, impaired cognitive skills and a short attention span. Children with ADHD also show symptoms of inability to concentrate and are distracted easily, mimicking a short attention span.
Lead poisoning, even at low levels, can create a number of problems. Some complications of lead toxicity include mental retardation, decreased school performance, short-term memory problems, inability to concentrate and decreased cognitive function. Many of these symptoms are also seen in children with ADHD.
Food Allergies Or Vitamin Deficiencies
Hypoglycemia, also called low blood sugar, can cause a number of symptoms similar to ADHD including aggression, hyperactivity, inability to sit still or low concentration levels. In addition, some people also have an adverse reaction to chemicals in food, such as, MSG, red dye, corn syrup or additional additives. These reactions can include anger, agitation, impulsiveness, hyperactivity and lack of concentration.
A Seizure Disorder
Some children with mild seizures can experience “absence seizures” lasting only a few seconds. Sometimes these seizures are not even noticeable. After a seizure there can be a period of several hours where someone feels disoriented and confused, causing difficulty following directions or being attentive.
A Sleep Disorder
Although people with ADHD notoriously have difficulty sleeping, they may or may not have a sleep disorder. The inability to get a good night’s sleep interferes with many daytime activities. People that lack sleep can have a hard time concentrating, communicating, following directions, and may suffer decreased short-term memory. People with ADHD may experience many of these symptoms, unrelated to getting a good night’s sleep.