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.
You should see your doctor about the diarrhea you're experiencing if: 1  Your diarrhea has lasted for more than two weeks (either intermittently or present the entire time) 2  You see blood in or on your stool. 3  You have persistent cramps or severe pain.  You are 1  vomiting. You experience alternating constipation and diarrhea.