Leaky gut. This syndrome is not accepted as authenic by most physicians and has no official code (icd9). Increased permeability of the intestinal tract is seen with taking nsai agents, certain inflammatory diseases such as ulcerative colitis, ra, regional enteritis etc. A flase blind loop syndrome, intestinal candidiasis and certain infections can resemble this condition.
Unknown. Genetics might play a role. No way to truly define who will develop which disorder and who will not. Kind of like gambling in vegas.....Some win.....Some lose.