As per WHO, Diarrhoea is defined as the passage of three or more loose or liquid stools per day (or more frequent passage than is normal for the individual). Frequent passing of formed stools is not diarrhoea, nor is the passing of loose, "pasty" stools by breastfed babies.
It is usually the symptom of gastrointestinal infection, which can be caused by a variety of viral, parasitic and bacteria organisms.As per UNICEF report, diarrhoeal diseases account for nearly 1.3 million deaths a year among children under-five years of age making them the second most common cause of child deaths worldwide. Over half of the deaths occur in just five countries: India, Nigeria, Afghanistan, Pakistan and Ethiopia. It is both preventable and treatable. Severe diarrhoea leads to fluid loss and may be life-threatening particularly in young children and people who are malnourished or have impaired immunity. Infection is spread through contaminated food or drinking-water or from person to person as a result of poor hygiene. Diarrhoea caused by contaminated food or water while travelling is often known as traveller’s diarrhoea.