Currently, experts have no clear idea about what leads to the development of multiple sclerosis However, today there is evidence to suggest that a certain role in this play are genetic factors, environmental conditions, or even viruses.

How does the state of the environment on an individual's risk of developing multiple sclerosis?

Data from epidemiological studies reveal some interesting trends: the incidence of multiple sclerosis in different populations and ethnic groups differs markedly.

This disease is especially common in Scotland, the Scandinavian countries and almost the entire territory of northern Europe. In the US, the incidence of multiple sclerosis is higher among whites than among other racial groups.

Studies show that in some regions of the world of multiple sclerosis is more common, however, if a person moves from high-risk areas in the low-risk zone, the risk of multiple sclerosis for it is reduced only to the extent that the transfer occurred before the onset of adolescence.

These data suggest the presence of some environmental factors predisposing to the disease of multiple sclerosis in the case if the body confronted him in dopubertatnogo age.

Moreover, multiple sclerosis is considered a "disease of temperate climates." Its prevalence in both hemispheres of the Earth increases with distance from the equator.

In addition, there are cases "epidemic of multiple sclerosis" - because, after World War II it was distributed to the population living in coastal parts of Denmark, which also makes us think about the presence of environmental causes of multiple sclerosis.

What role does heredity?

It is believed that multiple sclerosis may be inherited (from parents to children). Relatives of patients with multiple sclerosis (first, second and third degree) have an increased risk of developing them. We loved the sisters and brothers of the patient, this risk is from 2 to 5%.

It is assumed that a predisposition to the disease multiple sclerosis is caused by multiple genes. There are theories that multiple sclerosis develops when a person has an innate genetic predisposition to an adverse reaction to some environmental factor, in a collision with which the autoimmune reaction is triggered.

Modern methods for the identification of genes can help in the search for answers to questions about the role of genetic factors in the development of multiple sclerosis.