Epidemiology of Chronic Diarrhea Among Children Admitted to Gastroenterology Unit at Assuit University Children Hospital

Chronic diarrhea is defined as stool volume of more than 10g/kg/day in toddlers/infants and greater than 200 g/day in older children that lasts for 14 days or more. Chronic diarrhea has many of causes can calcified as infectious \& noninfectious causes. * Infectious causes as: - Escherichia coli, Giardia Lamblia, tuberculosis, Clostridium difficile \& Shigella. * Noninfectious causes as(Abnormal digestive processes- Nutrient Mal -absorption- Immune/ inflammatory- Defects of electrolyte And metaboliteTransport- Motility disorders- Diarrhea associated With exogenous substances) There are four basic pathophysiological categories of diarrhea: as ( osmotic diarrhea- secretory diarrheas- motility related diarrhea- Inflammatory diarrhea)