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.
Parasitic causes of diarrhea: Introduction. Parasitic causes of diarrhea: Parasitic causes of diarrhea caused by a parasite infection. See detailed information below for a list of 7 causes of Parasitic causes of diarrhea, Symptom Checker, including diseases and drug side effect causes.Â» Review Causes of Parasitic causes of diarrhea: Causes | Symptom Checker Â».arasitic causes of diarrhea: Comorbid Symptoms. Some of the comorbid or associated medical symptoms for Parasitic causes of diarrhea may include these symptoms: 1  Abdominal pain. 2  Abdominal symptoms. 3  Bowel movements.