The purpose of this study was to observe the natural progression of untreated syphilis in rural African-American men in Alabama under the guise of receiving free health care from the United States government.
1 Diarrhea is caused by increased secretion of fluid into the intestine, reduced absorption of fluid from the intestine or rapid passage of stool through the intestine.  Symptoms associated with diarrhea include abdominal pain, especially cramping. Other symptoms depend on the cause of the diarrhea.
What Is Diarrhea? Diarrhea is the passage of frequent stool, unformed or liquid in consistency, through either the body's natural (anus) or diverted (ostomy) opening. Diarrhea is a symptom, rather than a disease, often produced or induced in response to another condition or treatment (i.e. cancer treatments such as chemotherapy or radiation). Diarrhea is sometimes referred to as the runs or the trots.. Other possible causes of diarrhea include: Radiation to abdomen or pelvis.