Dandelion is a kind of traditional Chinese medicine, and the whole herb is used as medicine, and there is no obvious difference in the efficacy of its roots and leaves. Dandelion in water mainly has the effect of clearing heat and detoxification (removing heat and toxicity from the body), eliminating swelling and dissipating lumps, and diuretic and diaphoretic (improving the problem of incomplete urination and small amount of urination). Dandelion is bitter, sweet, cold in nature, and belongs to the liver and stomach meridians. It can be used to treat furuncles (sores mostly occurring on the limbs or face, small in shape with deep roots, as hard as nails), breast carbuncle, scrofula (mainly refers to tuberculosis of the lymph nodes in the neck), redness of the eyes, sore throat, carbuncle of the lungs, jaundice with dampness-heat, feverish gonorrhea (burning and stinging pain during urination, accompanied by frequent urination and urgent urination, and discomfort of the small abdominal tracts), astringent pains and other conditions. Dandelion also has the effect of clearing the liver and brightening the eyes (clearing liver fire to promote vision recovery), and can be used to treat conditions such as redness and swelling of the eyes caused by inflammation of the liver fire. Dandelion adverse reactions and contraindications are not clear, excessive dosage can lead to slow diarrhea. Dandelion water medicinal efficacy is limited, can not be used to treat the disease, such as symptoms, it is recommended that timely hospital consultation, under the guidance of the doctor to identify the use of medication, do not dispose of their own.