Generally overnight chrysanthemum tea is not allowed to drink, because it is easy to harbor bacteria or deteriorate within the tea, which is not conducive to the health of the organism. Chrysanthemum is a kind of medicinal food, with the effect of clearing heat and detoxification (removing heat and toxicity from the body), calming the liver and improving eyesight, etc. It is generally used for treating externally-induced wind-heat, headache, dizziness, vertigo, redness of the eyes, high blood pressure disease, furuncle (sores mostly occurring on the limbs or the face, with the shape of a small root base deep, as hard as nails), and swollen poisons. Moderate consumption of chrysanthemum tea can play a certain auxiliary therapeutic effect on the above diseases, but the active ingredients of the Chinese medicine infusion are limited precipitation, and cannot replace the therapeutic effect of the Chinese medicine soup. Overnight chrysanthemum tea is prone to bacterial growth, which may cause diarrhea, abdominal pain and other discomforts after drinking. Therefore, overnight chrysanthemum tea is not allowed to drink. The adverse reactions and contraindications of chrysanthemum are not clear, if you need to take, please take under the guidance of a professional physician to identify the evidence.