It is necessary to find out when diarrhea arose, its duration and severity, the circumstances of the onset of the disease (including recent travel, food consumed, water sources and medications taken, as well as any antibiotics during the previous 3 months), abdominal pain and vomiting, frequency and time of bowel movements, changes in the stool (for example, blood admixture, changes in color and consistency, signs of steatorrhea) and related changes in weight and appetite, as well as sudden urge to stool or tenesmus.