These include people who have too many unfriendly bacteria in their digestive tract, people who take anti-cancer drugs and people who have had part of their intestines removed. WebMD does not provide medical advice, diagnosis, or treatment. People who are allergic to English banana pollen, grass pollen, or melon may have a severe allergic reaction when taking psyllium. It is not a substitute for professional medical advice, diagnosis or treatment and should not be used as a basis for making decisions about your health. This is especially true if you are pregnant, have an existing medical condition, or are taking other medications, herbs, or dietary supplements. Never disregard the advice of a health care professional when seeking treatment for something you have read on the Web site®. Naturalists have tried chamomile tea to treat digestive problems such as stomach upset, colic and nausea, as well as anxiety and insomnia. This tool does not provide medical advice. THIS TOOL DOES NOT PROVIDE MEDICAL ADVICE. However, people with certain plant allergies, such as ragweed, may have an allergic reaction to chamomile. In its non-purified form, licorice can also have side effects, including high blood pressure in some people. Some experts believe that L-glutamine supplementation may help relieve diarrhea caused by surgery, infection, or stress. Supplements are used to treat certain gastrointestinal problems and for general digestive health. But it can cause allergic reactions in people who are allergic to ragweed and its associated pollen. DGL is a specific liquorice extract from which a certain chemical has been removed and does not appear to have as many side effects.