Duodenal ulcers can be extremely painful, and are often caused by a bacterial infection, which can then be exacerbated by alcohol, spicy foods, or other factors. Chamomile tea, however, has a number of inherent antibacterial and detoxifying qualities that can improve the health and wellness of your duodenum and gastrointestinal tracts. By clearing out any bacterial infections and soothing the inflammation, it is possible to reduce the size of duodenal ulcers, or eliminate them completely.