According to traditional Chinese medicine and folk custom data, it refers to the products that move the wind and generate phlegm, send poison to help fire and evil, and are prone to induce old illnesses and add new illnesses. The scope of the "hair" is broader, and some even expanded. The so-called "hairy things", according to folk customs and "with the rest of the house diet spectrum" and some other literature summarized, the common hairy things are pork, chicken, eggs, donkey, roe deer, beef, mutton, dog, goose, goose eggs, duck eggs, pheasant meat and other meats; carp, chub, squatting fish, crabs, whitefish, yellowtail, squid, pomfret, shad, perch, fish, fish, fish, and so on. Yellowtail, shad, perch, sturgeon, carp, octopus, flounder, minnow, scallop, bighead carp, eel, mussels, clams, shrimp, crab, and other aquatic products; vegetables such as toon head, brussels sprouts, coriander, mustard, spinach, bean sprouts, lettuce, eggplants, wild rice, leeks, bamboo shoots, pumpkin, cucurbits, mushroom, mushrooms, and other vegetables; melons and fruits such as apricots, plums, peaches, ginkgoes, mango, plums, cherries, lychees, melons, and other fruits and vegetables such as green onion, pepper, ginger, garlic, and other pungent vegetables; and fruits such as green onion, pepper, garlic, and other pungent vegetables such as duck eggs, duck eggs, and other meats. Pepper, ginger, garlic and other spicy and stimulating flavored foods; and vegetable oil, bad, wine, white wine, peas, soybeans, tofu, bean curd, silkworm chrysalis, etc., and sometimes meat and fishy and shameful and other foods are considered as hair, especially in the suffering from sores and swelling and poisonous, or chronic eczema and dermatitis and other skin patients as well as patients with allergic disorders, hair more important to avoid food.

The reason why the hair products will lead to the recurrence of old diseases or aggravate the condition, some scholars believe that there are three possibilities: First, these animal foods contain certain hormones, which will contribute to the body's some of the hyperfunction or metabolic disorders. For example, glucocorticosteroids can induce the spread of infection, bleeding ulcers, seizures, etc. when the dose exceeds the physiological dose, causing the recurrence of old diseases. Secondly, the heterogeneous proteins contained in certain foods become allergens, causing the recurrence of allergic diseases. Such as sea fish, shrimp and crab often cause skin allergies urticaria, eczema, neurodermatitis, impetigo, psoriasis and other persistent skin disease attacks. Tofu milk can sometimes cause asthma relapse. Third, some of the more irritating food, such as alcohol, onions and garlic and other spicy and irritating food on inflammatory infections foci, it is very easy to cause the spread of inflammation, boils go yellow. This is what Chinese medicine said heat confirmed evidence avoid eating spicy stimulating hairy reason.

The Chinese medicine treatment is very concerned about dietary taboos, often warn the patient "can not eat". In the process of treatment, many patients often ask: "I eat this disease which things are good? Should I avoid eating?" Many drugs can supply the body's daily needs of a variety of nutrients, but also health care, rehabilitation and conditioning, to get rid of diseases. At the same time, for some people, there are foods that can also reduce the efficacy of drugs, affecting the body's recovery, and even lead to disease. Therefore, for those foods that are not conducive to healing, often commonly referred to as "hair". In a broad sense, the hair is to refer to the disease to take medication and post-disease conditioning of the eating process, due to food inappropriate and induced by the production of some kind of disease, stimulate new diseases, or impede the treatment, aggravate the condition, affecting the recovery of a class of food. Generally speaking, it is a class of spicy and dry flavor, irritating, greasy, thick taste, fish and seafood food. Because the hairy food is not conducive to the treatment of the disease and the recovery of the body, so the disease should be avoided. The characteristics of the disease, generally fever, sores, fire, wind, phlegm, flatulence, constipation, diarrhea, as well as induced chronic diseases. Like modern medicine refers to the allergic diseases in the ingested food allergies in certain manifestations, such as allergic purpura, dermatitis, eczema, enteritis, urticaria, etc., are included. When should we avoid food? When the food affects the treatment of disease, help the evil to hurt the positive, add to the disease to benefit the disease should be avoided. Such as urticaria, dengue, eczema, sores, stroke, dizziness and other diseases, not and eat seafood fish, shrimp, crab, shellfish, pork, chicken, goose, eggs and so on. Another example is a variety of bleeding disorders: leakage, menorrhagia, vomiting blood, hemoptysis, nosebleed, subcutaneous hemorrhage, blood in the urine, hemorrhoids and other conditions, should not consume pepper, mutton, dog meat, soju and so on. Another example is ulcer disease, chronic gastritis, dyspepsia and other conditions, should not eat white wine, beans, potatoes and so on. Avoid food when it is prone to adverse reactions with drugs. When the role of eating food and drugs produce the same effect, it will weaken, offset the efficacy of drugs, and even produce toxic side effects, thus hindering the treatment of disease. Such as the "Compendium of Materia Medica" records: "Where the medicine, not eat fat dog meat, greasy soup perch, stench and stench of all things. Where the medicine, do not eat raw garlic, caraway, ginger, the fruit, the slippery things", not unreasonable. Such as the consumption of Huanglian, licorice, Cang Erzi, plums, withered stalks and other contraindications of pork, turtle shells taboo amaranth, rhubarb, Shouwu taboo onion, garlic, radish, etc., traditional Chinese medicine taboo focusing on this.

When the food is unfavorable to the adjustment of recovery after the disease to avoid. The first recovery from a serious illness, digestion is weak, the positive energy has not been restored, dietary disorders, can make the disease recurrence or change other diseases. Such as fish, shrimp, crab, shellfish, toon buds, mushrooms, as well as certain livestock meat, eggs, etc., who have suffered from allergic diseases, should pay attention to choose to avoid eating. Another example is hyperlipidemia, hypertension, coronary heart disease, stroke, etc., after the disease, the diet should be light, do not eat greasy thick things.