Intestinal infections are caused by harmful microorganisms, such as bacteria, viruses, or parasites, that invade the digestive system. Common symptoms include diarrhea, abdominal pain, nausea, and vomiting. These infections can result from contaminated food or water, poor hygiene, or close contact with infected individuals. Preventing intestinal infections involves practicing good hygiene, such as washing hands regularly and ensuring food is cooked properly. Vaccines are available for some viral infections, like rotavirus, which can help reduce the risk, especially in young children. Staying hydrated is also crucial during an infection to replace lost fluids.