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 these 4 conditions have in common is an inflammation of the digestive tract. This causes a number of different symptoms and diarrhea is a common one. These symptoms, including diarrhea, are often triggered by eating specific types of food. For example, people with celiac disease can often experience diarrhea if they eat foods containing gluten. Foods containing milk or yeast can also trigger bouts of diarrhea.