An intestinal infection occurs when harmful microorganisms, such as bacteria, viruses, or parasites, invade the digestive tract. 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. Treatment often involves staying hydrated and, in some cases, taking medications to eliminate the infection. Preventive measures include practicing good hygiene, washing hands regularly, and ensuring food is cooked properly. Common causes of intestinal infections include Salmonella, E. coli, and Norovirus.