Dandelion in water is not very useful for coughing up blood and yellow phlegm. The main effects of dandelion are clearing heat and detoxification (removing heat and toxicity from the body), eliminating swelling and dispersing knots, and inducing diuresis and diuresis. And dandelion water may have limited active ingredients, can not achieve the effect of treatment. If you need to use the drug, you need to use under the guidance of a doctor. Dandelion has the main treatment of carbuncle furuncle (a skin disease, refers to the degree of serious furuncle), breast carbuncle carbuncle, hot lymph (burning stinging pain obvious when urinating, accompanied by urinary frequency and urgency, abdominal traction discomfort), astringent pain, dampness-heat jaundice and other diseases. Coughing up blood and coughing up yellow phlegm may be due to phlegm-heat in the lungs, wind-heat against the lungs (wind-heat evil invasion of the lungs) or yin deficiency and dryness of the lungs (deficiency of the body’s yin, resulting in dryness of the lungs can not be nourished) and so on, taking dandelion water can help to clear away the heat and detoxify the toxins, but the therapeutic effect is not very big. And dandelion is usually used for decoction, with the water bubble may be due to the active ingredients in the water effective, can not achieve the efficacy of the treatment of disease. It is recommended to take the correct herbal treatment under the guidance of a doctor’s diagnosis.