Malignant tumor is a kind of systemic disease with local manifestation that is difficult to be treated. Patients and their family members have high expectation on surgery, radiotherapy, chemotherapy and traditional Chinese medicine, but they also attach great importance to dietary treatment. However, they are confused by the ancient and modern folklore and medical beliefs about contraindication, and are eager to understand the influence of contraindication on the treatment and recovery of tumor patients. Avoidance of food refers to the caution or prohibition of certain foods when one is sick, and these cautioned or prohibited foods are called “hairy substances”. The hairy food for malignant tumor patients of course refers to those foods that can promote the recurrence, metastasis and progress of tumor. In China, there are many folk sayings that tumor patients should avoid eating hairy food, such as rooster, fish without scales, shrimp, crab, sow pork, pork head, dog meat, leek, beef and mutton. In clinical work, we often distinguish various kinds of taboos in the past generations as taboos before illness, taboos during illness and taboos after illness. If tumor patients and their families have some understanding of this, and have a more correct understanding of the taboo issue, they may not feel so much at a loss in actual life, or be deceived. A. Pre-illness mouth, also known as anti-disease mouth. Or food and nutrition taboo. Before the disease, because there is no disease, so the diet at this time, is to prevent disease and strengthen the body. Pre-illness stage of the taboo, mainly based on the person’s physique, region, age, season, special physiological period, good history of disease, etc. daily diet taboos, the purpose is to adjust the balance of the body’s qi and blood, yin and yang, to avoid disorders, to prevent disease, which is also an important aspect of the spirit of prevention. 1, according to the body type taboo If the body type is hot, is a Yin deficiency Yang hyperactive body, or real hot body, avoid eating warm spicy fire food, such as chili, mutton, dog meat, ginseng, antler, gui yuan, litchi, shrimp, etc.; if the body type is cold, is a Yang deficiency body, avoid cold cold cold harm Yang products, such as cold water, cold dishes, cold nature of the fruit such as watermelon, pear; if the body is obese, white face, thick and greasy tongue. If the body is obese, white, thick and greasy tongue, the body belongs to phlegm and damp, avoid eating greasy, drink less or do not drink beer, especially cold beer, etc. 2. According to the region and season, if you are located in a cold and wet region (season), you should not eat cold and draining foods such as cold drinks, bitter melon, winter melon, cucumber, etc. to prevent injury to Yang and help cold; if you are located in a warm region (season), you should not eat spicy, fire-aiding and Yang-supplementing foods such as chili, mutton, wine, fatty meat, etc. If you are in a region with a high incidence of cancer, avoid eating moldy and pickled foods. 3.According to the age, children are “pure yang body” and their internal organs are delicate. The spleen is often inadequate, so avoid excessive consumption of hot, warm, fishy, Yang-aided products to prevent the “pure Yang” from becoming more vigorous, and avoid eating hard, greasy, thick-tasting food to prevent the spleen and stomach from being cut down. Older people are often “Yin is often insufficient, Yang is often surplus”, because of the work, the energy to pay for the cost of consuming a certain amount of qi and blood, expressed in the body is a lack of Yin. Therefore, the elderly should pay attention to light to nourish yin, tonic also to clear tonic, flat tonic. Excessively nourishing food, such as dog meat, seafood, deer antler, etc., should be eaten sparingly. 4, according to medical history, such as a history of gastric disease, should pay attention to eat easily digestible food, thick tonic, difficult to digest food should be respectful; hypertensive patients, should pay attention to low salt diet, to prevent triggering or aggravate the symptoms of hypertension. 5, according to the special physiological period taboo women menstruation, avoid eating cold and cold things, before the fetus avoid eating slippery or fire products, after the birth of avoid cold and astringent products, etc., have a special disease prevention effect. 6, according to the cause of disease, avoid eating “disease from the mouth”, improper diet is one of the triggers of tumor development, diet should avoid and exclude the continued role of tumor development factors. Nitrosamines, additives with carcinogenic effect and other harmful substances such as 3,4~benzopyrene, asbestos fiber, aflatoxin, fusarium crosstalkii, cross-streptavidin monomethyl ether and other contaminated food have a catalytic effect on the development of cancer and should be highly alert. In the usual diet, do not eat and drink too hot food, do not eat things containing too much fat, do not eat improperly cooked, severely burnt, fried, fried and smoked chicken, duck and fish, and do not eat rotten and spoiled vegetables and moldy peanuts, corn, wheat, rice and less salt moldy pickles, sauerkraut and meat, because moldy food contains aflatoxin, pickled food contains Nitrite and other strong carcinogens. Eat less canned food, pay attention not to drink strong alcohol. The main purpose is to reduce the disease and help recovery. It can be divided into general taboos, taboos due to illness, taboos due to disease, taboos due to medicine, etc. Most of the patients with malignant tumor are under great mental stress or damaged by treatment, most of them have weakened spleen and stomach transportation, resulting in anorexia or abdominal distension and stomach discomfort, so they should avoid cold and hard food and iced drinks that are difficult to digest, and pay attention not to drink strong wine. 2, due to the disease avoid eating about the onset of the problem should pay attention to the diet, Chinese medicine has always attached more importance to a person after the disease, in addition to the application of drug therapy, but also must pay good attention to dietary regimen. Some foods must be avoided from the beginning to the end of a disease. For example, patients with combined asthma should avoid allergic hair; patients with insomnia should avoid drinking strong tea, avoiding too much dinner; combined gastrointestinal diseases, avoiding indigestible food, avoid eating cold, especially cold meat; people with drug allergies should avoid food that can cause allergies. In particular, do not eat food with carcinogenic factors to prevent the further effect of carcinogenic factors. 3. Avoid eating foods that move blood, such as ginseng, deer antler, pepper, cinnamon, fennel, ginger, dried ginger, dog meat, venison, etc. In case of edema or fluid in body cavity, we should avoid heavy salty taste. As tumor patients have more phlegm, dampness and stasis, they should avoid fatty, sweet, thick and cold food, such as watermelon, winter melon, bitter melon, turtle meat, duck meat and crab, etc. 4, due to the drug and treatment factors to avoid this is the most common taboo content. Patients taking drugs, must avoid certain foods that have an adverse effect on the drugs taken, especially the food that is antagonistic to the drug, the clinician will have to give instructions on this. There is no strict restriction on drinking mung bean soup or tea while taking medication. During radiotherapy, patients may experience dry mouth and dry tongue, and other manifestations of heat toxicity injuring yin, while chemotherapy and surgery can also lead to loss of yin and blood, producing internal heat. Therefore, caution should be exercised in the use of pungent and dry food in the diet to avoid injuring yin and depleting fluid; and pungent and dry food can also easily cause or aggravate bleeding, which is detrimental to the condition. Patients should not use or minimize the use of roasted, fried, fatty, sweet, thick and spicy products. The meal should not use more cinnamon, fennel, pepper, nutmeg and other condiments. Third, after the disease to avoid the mouth after the evil to the injury, often need to rely on dietary adjustments to make the body gradually recover, but most of the disease relapse, but also with improper diet related. Generally speaking, after the disease, eating, it is appropriate to liquid, semi-liquid, soft food, hard food in the order of gradual progress, avoid the disease a good on the big fish and meat, resulting in adverse consequences. Usually a person’s constitution is relatively stable or not easy to change, so for malignant tumor patients, it is very necessary to refer to the contents of the taboo before the disease, the purpose is still to adjust the balance of qi and blood, yin and yang of the body to avoid the disorder again, so as to avoid the recurrence and metastasis of tumor. There are always two opposing sides of the coin, and there are two very different views on the issue of contraindication. One is that all do not avoid, all food containing nutrition can be eaten, avoid food will affect the intake of nutrients, resulting in malnutrition and weaken the body’s ability to resist disease; another point of view is generalized, without analysis, to advocate the taboo of many beneficial food, so that patients have nothing to eat. Through the introduction of the previous contents, we believe that both views are one-sided and not relevant to objective reality. At present, there is a lack of effective means to cure malignant tumors, and some patients have relapsed soon after surgery and radiotherapy. As the reasons for recurrence are not well understood, some patients and their families attribute the possible factors of recurrence to careless diet or lax “taboo”. In some places, it is said that chicken cannot be eaten, fish, shrimp and seafood are “hairy”, and scaleless fish cannot be eaten. In many ancient prescriptions, there are many corresponding “taboos” according to the different drugs, and some are quite strict. In our clinical work, we have not encountered any cases of recurrence or worsening of the disease due to lax “taboos”. Some early stage patients with good results of radical surgery and reasonable follow-up treatment did not have recurrence or metastasis even without dietary “avoidance”, which shows that there is no scientific basis for blaming recurrence and metastasis entirely on lax “avoidance”. Further scientific research is needed on the issue of “avoidance of food”. Our view is that diet has a close relationship with the development of cancer, and proper “avoidance of food” is still needed, but we should insist on opposing the behavior of over-emphasizing “avoidance of food”. The “taboo” for malignant tumor patients is advocated under the principle of “evidence-based diet” and should be in accordance with the principle that restrictions should not be too strict and recipes should not be too narrow. Some people make a fuss, so that patients are at a loss, even tofu, vegetables and so on are afraid to eat, resulting in the deteriorating nutritional status of patients, which is very harmful.