Rhubarb has the effects of diarrhea, clearing heat and fire (removing heat and fire from the body), cooling the blood and detoxifying the toxin (referring to the treatment of blood-heat and toxin), etc. It is used in sores and ulcers. Compared with raw rhubarb, cooked rhubarb has a slower diarrhea and is especially good at diarrhea and detoxification (removing fire and toxicity from the body), and is often used for fire sores. It is not suitable for people with weak spleen and stomach. It should not be taken during pregnancy or lactation. Rhubarb is bitter and cold in nature and belongs to spleen, stomach, large intestine, liver and pericardium meridians. It has the effects of diarrhea and attacking accumulation, clearing heat and fire, cooling blood and detoxifying, expelling blood stasis and clearing menstruation, and inducing dampness and eliminating yellowish color. Rhubarb can be used in treating constipation due to solid heat, epistaxis (vomiting of blood and nosebleed due to blood heat), eye and throat swelling, carbuncle furuncle (sores occurring on the limbs or face, small in shape with deep roots, hard as nails), carbuncle in the intestines (carbuncle occurring in the bowels of the intestines, manifested by fever, pain in the right side of the abdomen, and a palpable mass), and abdominal pain. Compared to raw rhubarb, ripe rhubarb laxative force slow, especially good at diarrhea detoxification (to get rid of the body of fire and poisonous evil), mostly used in the treatment of fire sores and ulcers. Cooked rhubarb is cold in nature and should not be taken by people with weak spleen and stomach. Nausea, dizziness and constipation may occur after taking rhubarb. It should not be taken during pregnancy or lactation. During the period of taking ripe rhubarb, avoid eating cold and irritating food, and take it under the guidance of a doctor.