A hiatal hernia does not cause many symptoms by itself, but when a sliding hernia occurs, the abnormal location of the gastroesophageal (GE) junction above the diaphragm affects its function and stomach contents can reflux into the esophagus.
-You need to work on sentence structuring. For example, when you wrote, The immigration, as a decision maked by a person is an act that occurs, because of some factors especially in the under developed countries and the most importants causes or reasons are mainly social reasons, politic reasons and economic reasons..
Often refugees do not carry many possessions with them and do not have a clear idea of where they may finally settle.Push and pull factors are often used to explain why people migrate:Push factors are the reasons why people leave an area, ie what pushes them away from their home.ush factors include: lack of services, lack of safety, high crime,crop failure,drought, flooding, poverty and war.Pull factors are the reasons why people move to a particular area, ie what pulls them to a new place.