Recent studies have shown a strong influence of the hereditary predisposition on the disease. Foreign doctors are inclined to believe that dyslexia may be associated with latent left-handedness.
The main cause of dyslexia is brain dysfunction, which may be caused by the influence of some biological factors. For example, perinatal dyslexia can be provoked by brain damage, which, in turn, can be caused by:
- maternal anemia;
- heart disease of mother and fetus;
- prolonged labor;
- fetoplacental insufficiency;
- premature detachment of the placenta;
- entanglement and abnormal development of the umbilical.
Toxic defeat of CNS can lead to:
- alcohol and drug intoxication;
- hemolytic disease of the fetus;
- jaundice in the newborn.
Infectious lesions can cause dysfunction because of pregnancy period diseases (measles, rubella, influenza, etc.).
Brain damage is caused mechanically by:
- expulsion of the fetus manipulations;
- protracted labor;
- intracranial hemorrhages.
Even if it has not been observed that a child has any of the above mentioned causes, there are some after birth factors, leading to delay of the maturation of the cerebral cortex, which leads to dyslexia. These factors include:
- traumatic brain injury;
- infections such as rubella, measles, chicken pox, polio, etc.;
- severe chronic diseases.
Diseases that can be accompanied by dyslexia are:
- cerebral palsy;
- impaired mental function;
- mental retardation.
This can be due to abnormalities of brain zones.
There are also adverse social factors, such as:
- deficit of verbal communication;
- pedagogical neglect;