Often, tumor patients and their families ask their doctors whether they should avoid eating food after surgery, and whether eating hairy food will lead to tumor recurrence and affect wound healing. Hairy food is a concept of traditional medicine, and there is no accurate terminology in modern nutrition. In simple terms, hairy food is food that can induce disease, which often includes goose, hen, mutton, milk, egg, crab, shrimp, soybean products, grass carp, kelp, leek, parsley, shiitake mushroom and so on in the classical version. Beijing Friendship Hospital thoracic surgery Gao Zhi ancient people do not have modern medical knowledge, can only generalize the food eaten before some people have adverse reactions are generally attributed to the hair to warn future generations. It was difficult for them to analyze whether the incident was causally related to the food, whether it was due to personal constitution, whether it was due to unclean food, whether it was due to improper processing, etc. If we interpret it from the perspective of modern medicine, the symptoms of “hair” are similar to the organism’s metamorphic reaction. First of all, people who are allergic to certain food should not eat it no matter they have tumor or not, and few people will suddenly become allergic to mutton, shrimp, etc. after surgery. Secondly, fish and shrimps are easy to produce histamine and other amines under the condition of spoilage, and eating these unhygienic foods can easily make people appear hives and other symptoms. The reasons for recurrence of tumor after surgery are low immunity status of patients, micro-metastasis of tumor and tumor residue in surgery, while the factors affecting wound healing are local infection and ischemia, age, nutritional status, blood sugar, immunity status and the use of hormones and other drugs. On the contrary, strict contraindication will lead to poor nutrition and lower immunity, which will affect wound healing and increase the chance of tumor metastasis. In conclusion, the definition of hairy food is rather vague and should not be taken as an inherent property of food. All kinds of common foods in our market have been used by countless people and their ingredients have been studied thoroughly, so as long as we understand our own body condition, do not eat foods we are known to be allergic to before the disease, and pay attention to choosing fresh foods and cooking methods, there is no need to choke on them for the sake of traditional claims without evidence.