Hu Huanglian is mainly used for treating yin deficiency, such as bone vaporization and tidal fever (a burst of heat, feeling that the heat comes from inside the bone to the outside), night sweating (abnormal sweating after going to sleep, but the sweating stops after waking up), redness of the eyes, swelling and pain, hemorrhoids, etc. It is cold in nature and bitter in taste. Hu huanglian is the dried rhizome of Hu huanglian, a plant of the family Xuanxianaceae, which is cold in nature, bitter in taste, and mainly goes to the liver, stomach and large intestine meridians. It has the efficacy of subduing deficiency heat, removing chancre heat, eliminating bone vapor, clearing heat and drying dampness (removing heat and drying dampness). This product is mainly used in the treatment of bone vapor, night sweating, damp-heat dysentery (dysentery caused by damp-heat evil), jaundice (the main symptoms of which can be seen as yellow body, yellow eyes, yellow urine), redness and pain of the eyes, vomiting blood, epistaxis, hemorrhoids, redness, swelling and pain, etc. It is also used in the treatment of diarrhea and jaundice. It should be noted that this product should be taken with caution by people with deficiency of spleen and stomach (weak and cold spleen and stomach). If you have symptoms, you should take the medicine under the guidance of a medical professional. Do not take the medicine blindly on your own, in order to avoid delaying the condition or producing adverse reactions.