Rhubarb can be decocted and taken internally, as well as pounded or grated for external use. Rhubarb is the root of Polygonum acidum, with the functions of clearing heat and removing toxins (removing heat and toxicity from the body), cooling the blood and stopping bleeding (cooling and moisturizing the blood and preventing bleeding), removing blood stasis and eliminating swellings, laxative, and killing worms, and is mostly used for coughing up blood in lung consumption, carbuncle, vomiting of blood, stagnation of abdominal pain, bruises, constipation, mumps, carbuncle, burns, scabies, eczema, etc. It can be decocted and taken internally, and can also be pounded or ground to apply juice externally. The medicine can be taken internally by decoction, and can also be used externally by pounding or grinding the juice. Note that people with cold spleen and stomach and those who are physically weak should take it with caution. The specific use of the drug please under the guidance of a professional physician, do not use blindly, so as not to cause delays in the condition.