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..
Between 2007 and 2008, the Indian foreign-born population surpassed the Chinese and Hong Kong-born population to become the third largest immigrant group in the United States after immigrants from Mexico and the Philippines (see Table 1; see also the pie charts showing the top 10 countries of birth of immigrants residing in the United States over time here.).