Yin Chen is used in the treatment of jaundice with scanty urination, dampness and warmth (warmth caused by feeling dampness and heat), summer dampness and so on. Yin Chen is bitter, pungent and slightly cold in nature. It has the effect of clearing dampness-heat, relieving bile and eliminating jaundice. It is used for treating jaundice with low urine output, dampness, heat and summer dampness, and itching of wet sores. Clinically, Yin Chen is often used with cypress and Poria cocos to treat itching sores caused by dampness-heat, and it can also be used as a single decoction for external cleansing. Adverse reactions: large amounts of can cause nausea, vomiting, transient dizziness, arrhythmia and so on. Caution should be exercised for those who have blood accumulation and yellowing, and those who have blood deficiency and yellowing. The therapeutic effect of single Chinese medicine is limited, clinically need to be used with other Chinese medicines after identification by Chinese medicine practitioners.