If someone has diarrhea what system not working in their body?

If someone has diarrhea, it typically indicates a malfunction in the digestive system, particularly in the intestines. The intestines may not be absorbing water and nutrients properly, leading to loose, watery stools. This can be caused by various factors, including infections, food intolerances, or gastrointestinal disorders. The disruption in normal intestinal function results in the rapid expulsion of waste without adequate absorption.