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.
Diarrhea â loose, watery stools occurring more than three times in one day â is a common problem. There are many causes of diarrhea. Temporary diarrhea lasting three weeks or less could be a symptom of a foodborne illness and is usually related to bacterial, viral, or parasitic infection. Temporary diarrhea may also be caused by food intolerances, food allergies, or reactions to medicines.