Hello, burdock tea is a tea with the same origin of medicine and food. Generally, there will be no adverse reactions, but burdock tea has the effect of detoxification. Therefore, when drinking burdock tea for the first time, there will be various detoxification reactions, such as swollen gums and swollen parts of the body, but don't worry, it will disappear naturally after drinking for three to five days. Burdock is a good thing, I suggest you drink it all year round!