If your stomach is infected gastroenteritis, it is most likely the result of norovirus or rotovirus, and the symptoms can be debilitating and painful, albeit short-lived. Ginger is one of the most trusted substances to soothe stomach upset and reduce inflammation in the tissues and stomach lining. The active ingredient in ginger, gingerol, is also a powerful antioxidant that helps to boost the immune system, thus eliminating the virus causing gastroenteritis, while also preventing the nausea and vomiting that accompanies this common stomach flu.