This document provides an overview of diarrhea including its definition, incidence, types, causes, signs and symptoms, diagnosis, prevention, treatment, nursing management, and complications. It notes that diarrhea is a leading cause of death in children under five in Nepal. The document discusses acute vs chronic diarrhea and predisposing factors. Signs of dehydration and its classification and management according to WHO plans A, B, and C are outlined. Nursing interventions for diarrhea and associated dehydration are also summarized.