Stomach viruses, often referred to as norovirus or rotavirus, are highly contagious infections that cause inflammation of the stomach and intestines. Symptoms typically include nausea, vomiting, diarrhea, and stomach cramps. These viruses can spread through contaminated food, water, surfaces, or close contact with infected individuals. Most people recover from stomach viruses within a few days without needing medical treatment. Staying hydrated is crucial, as vomiting and diarrhea can lead to dehydration. Good hygiene practices, such as frequent handwashing, can help prevent the spread of these viruses, especially in crowded places like schools and nursing homes.