Gastroenteritis is an infection or inflammation of the digestive tract caused by viruses, bacteria, parasites, toxins, chemicals or drugs. It often results from contaminated food or water. Common symptoms include nausea, vomiting, diarrhea, abdominal pain and dehydration. Treatment focuses on rehydration. With proper treatment, gastroenteritis is usually resolved within a few days, though complications from dehydration may prolong recovery. Prevention emphasizes proper handwashing and food safety practices.