Gastroenteritis, commonly known as the stomach flu, is a prevalent gastrointestinal infection. It causes inflammation of the stomach and intestines, leading to symptoms like diarrhea, vomiting, abdominal pain, and sometimes fever. This condition is typically caused by viral or bacterial infections, often spread through contaminated food, water, or close contact with infected individuals, swimming in water polluted by sewage. Gastroenteritis is usually self-limiting and resolves within a few days with proper hydration and rest. However, in severe cases, it can lead to dehydration, requiring medical attention. Prevention includes practicing good hygiene, safe food handling, and vaccination against specific pathogens, where available.