When gastroenteritis strikes, the inflammation in your gut in response to the infection can be severe, often causing painful stomach upset and frequent vomiting. One of the most soothing substances for your stomach is chamomile tea, which is rich in antioxidant and anti-inflammatory compounds. This can prevent the vomiting that accompanies gastroenteritis, thus keeping the “good” bacteria in your stomach in place. Chamomile tea can also boost the immune system, helping to fight off future infections from the norovirus or rotovirus.