Onion, commonly known as onion. Known as the "vegetable queen" in Europe, it is rich in nutrients, including protein, sugar, crude fiber, calcium, phosphorus, iron, carotene, thiamine, riboflavin, nicotinic acid, ascorbic acid and other nutrients. Onions have a wide range of medicinal values. Hippocrates, known as the father of western medicine, thinks that onions are good for eyesight; Onions are appetizers; Indians regard onions as hormones, which are used for diuresis and phlegm elimination. During the American Civil War, the northern army wiped out dysentery with three cars of onions. Japanese medical professors believe that eating onions can stabilize blood pressure for a long time and reduce vascular fragility. Chinese medicine believes that onion is flat, sweet and pungent, and has the functions of invigorating the stomach, promoting digestion, calming the liver and moistening the intestines, inducing diuresis and sweating. Onion contains many chemical components such as sulfides, flavonoids, phenylpropanoids, steroidal saponins, chlorine-containing compounds and prostaglandins, and has pharmacological effects such as anti-inflammatory, antibacterial, anticancer, diuretic, antidiarrheal, blood sugar lowering, blood lipid lowering, cholesterol lowering, blood pressure lowering, prevention of platelet aggregation, prevention of cardiovascular and cerebrovascular diseases, oxidation resistance, beauty and so on. Onion flavor: Xin Wen. Meridian tropism: entering the heart and spleen. Efficacy: killing insects and removing dampness, warming middle warmer, resolving food stagnation, dissolving meat and removing grains, refreshing, lowering blood pressure and blood fat. Indications: Abdominal pain, dyspepsia, hypertension, hyperlipidemia and diabetes. Description: Onion, also known as onion, is closely related to garlic and has similar spicy taste and chemical structure. Onion contains almost no fat, but its essential oil contains a mixture, which contains sulfide, which can lower cholesterol. It is reported that onion is the only known plant containing prostaglandin, and it also contains components that can activate fibrinolytic protein activity. These substances are strong vasodilators, which can reduce the resistance of peripheral blood vessels and coronary arteries, resist the effect of pressor substances such as catecholamine in human body, promote the excretion of sodium salts, and thus lower blood pressure. It can be said that onion is a good plant medicine for patients with cardiovascular diseases such as hyperlipidemia and hypertension. So onions have been valued since ancient times.