Watery diarrhea is loose, runny stool that pours out rather than holds shape. It happens when the gut lining pumps extra fluid into the bowel or fails to soak up the fluid already there. Common triggers fall into five big groups: VirusesRotavirus, norovirus, and adenovirus top the list. They strike fast—often within 24 hours of contact—and usually clear in a few days. BacteriaSome germs make toxins that force the gut to secrete water (cholera-like). Others, such as certain strains of E. coli, Campylobacter, and Salmonella, damage the lining itself. Typical story: under-cooked poultry, raw eggs, or street food eaten 6–72... Learn more