I-What is Dyslexia?
Definition

Dyslexia is significant and durable deficit of the ability to write properly. This deficit cannot be explained by an evident cause. Dyslexia is a trouble to learn words and retain them that affect essentially boys. Troubles can appear despite not having any brain issues, social troubles, or even despite following a normal schooling process. Today, five to 15 percent of children are affected by dyslexia.

Discovery
Dyslexia has been recognized as a scholar and learning developmental problem by the World Health Organization in 1991. Dyslexia is not a dangerous disease and children can overcome it with a lot of work and a lot of time.

B-Symptoms and Consequences

Symptoms

The symptoms of dyslexia are mostly related to learning, writing, and reading. It exists different types of dyslexia: visual, phonological, of surface, mixed, and of attention. In the visual one, the child cannot read some words because he does not see them and simply skips them. This type of dyslexia is close to the attention one. The phonological one is related to the sound of words and letters. The dyslexia of surface occurs when the child cannot differentiate the shape of letters (“b” and “d”). Finally, the mixed dyslexia is a mix of the phonological and the surface dyslexia.

Consequences

The consequences of dyslexia are not as frightening as any other diseases affecting the brain such as autism. With dyslexia, the child might have trouble learning reading and writing, and might also lack attention. However, dyslexia can be overcome and a child may be able to catch up with non-dyslexia affected children with time and effort. Dyslexia is not a deadly disease and its symptoms vary depending on the child.

II-Chemicals Causing Dyslexia
List of Chemicals Causing Dyslexia

Names of Chemicals

Scientists are still working on proving the effects of some chemicals on the brain and their relation to dyslexia. Some chemicals due cause brain troubles and these troubles might be causing dyslexia. Manganese has an effect on the brain and diminishes brain functions and impairs motor skills. Some pesticides might cause cognitive delays. Lead is also a chemical involved in brain issues. Arsenic through drinking water has been linked to reduce cognitive functions in children.

Consequences on Health

The consequences on health vary depending on the amount of chemicals absorbed or breathed. If most of them cause brain troubles that could lead to dyslexia, the correlation has not been proven yet, and scientists are still debating.

B-Other diseases Caused by Dyslexia

Brain Issues Due to Chemicals

Other than dyslexia, chemicals cause diseases that are far more dangerous for the brain and health in general. For example, some chemicals are involved in the apparition of asthma. Others cause autism or even fatal intoxication and cancers such as lead, arsenic, pesticides.

The Danger of Chemicals

Chemicals are everywhere in our modern society. Producers of cereal, vegetables, or other produces use pesticides to protect their crops against insects and worms. Those pesticides find their way inside the food and therefore inside us. They can have a dangerous effect if absorbed in high quantity.

Some buildings are also made with hazardous materials like lead. Those materials, when breathed constantly, can have an effect on the lungs and lead to respiratory issues.