Diarrhoeal diseases refer to a group of gastrointestinal conditions characterized by the frequent passage of loose or watery stools. They are caused by various factors, including infections, food intolerances, and certain medications. The most common causative agents are viruses, bacteria, and parasites. In children, diarrhoea can be particularly dangerous, leading to dehydration and, in severe cases, even death if not properly managed. The risk of dehydration is high in young children due to their smaller body size and higher fluid turnover. The viruses responsible for diarrhoeal diseases include rotavirus, norovirus, and adenovirus. Rotavirus is one of the leading causes of severe diarrhoea in infants and young children. It spreads easily through contaminated food, water, or surfaces. Bacterial infections, such as those caused by *Escherichia coli* (E. coli), *Salmonella*, *Shigella*, and *Campylobacter*, are also common sources of diarrhoea in children. These bacteria are often transmitted through the consumption of contaminated