Onions are hairy substances. In Chinese medicine, the term “hairy food” usually refers to food that contains substances that will stimulate the human body after consumption, or that is similar in nature to some evil toxins that can cause disease, thus inducing disease or aggravating the original disease, such as garlic, pepper, leek, etc. The onion is flat, pungent and sweet, and is a pungent and stimulating food, so it can also be considered a hair product, and can be eaten in moderation according to personal health conditions. Onion as a hair product is mainly for people with weak gastrointestinal tract, post-surgical patients and patients with skin diseases such as sores. People with weak gastrointestinal tract should not eat raw onions because they can irritate the mucous membrane of the gastrointestinal tract and cause gastrointestinal discomfort; post-surgical patients should not eat onions because the irritation of onions may affect the recovery of surgical wounds; the irritation of onions can also cause the aggravation of symptoms in patients with skin diseases, and people who are allergic to onions should also avoid eating onions to avoid stimulating the organism to cause allergic reactions. However, as a vegetable, it also contains more nutrients, such as vitamins, fiber, prostaglandins, and a variety of minerals such as zinc and selenium, which can help maintain cardiovascular health when eaten in moderation, and dietary fiber can also promote gastrointestinal motility. So people without special circumstances can eat in moderation according to their personal preferences.