Gastroenteritis happens when an infection enters the body, and the digestive system becomes inflamed. The leading causes include a virus, bacteria, or other toxins. The symptoms typically only last a few days, but it is extremely contagious. If you are experiencing any of the symptoms mentioned, visit AFC Urgent Care West Hartford. Our physicians will be able to recommend the best type of treatment to have you feeling your best again. Symptoms & Causes of Gastroenteritis ...