Should cancer patients avoid eating “hairy foods”? In the book of Nei Jing, it is written that “the five tastes are forbidden”. In the Jin Kui Yao, it is said that “the taste of food is harmful to the body”, which means that improper diet can be detrimental to the body and even poisonous. Avoiding food is to control the diet to avoid such harm and toxicity. It is generally believed that cancer patients should abstain from eating hairy food, i.e. scaly fish, shrimp and crab, sea cucumber, beef, mutton, toon and other foods that are pungent and warm, warm and dry to help yang, meat and greasy and stagnant. Literally speaking, hair, including seizures, induced, stimulated, recurrence of the meaning. The foods of hair, generally known as hot and pungent, seafood, and fishy hair, have different characteristics of fever, sore, poison, fire, wind, dampness, phlegm, gas, cold and chronic diseases. Traditional Chinese medical theory does not have the name of cancer, but uses different names such as tumor and rock, but the content is not completely consistent with the modern medical cancer, so the avoidance of food for cancer patients cannot be based on the above-mentioned view. It is better for cancer patients to avoid eating according to the four gases of food (cold and cold). According to the four gases (cold, hot, warm and cool) and five tastes (pungent, sweet, sour, bitter and salty) of food, and taking into account the patient’s disease condition, weather, geographical environment, living habits and many other factors, we should implement “evidence-based food administration”. Specifically, we selectively avoid food according to the principle of “cold is hot, hot is cold”. If the patient’s symptoms are cold, he should avoid cold and cool foods that can easily harm the Yang, such as duck, lotus root, watermelon, pear, mung bean, etc. If the patient’s symptoms are hot, he should avoid hot and warm foods that can easily generate fire, such as mutton, dog meat, shrimp, eel meat, onion, chili, etc. In different stages of cancer treatment, scientific avoidance is also required. Before and after radiotherapy and surgery, patients often have two misunderstandings in diet, one is to blindly take tonic, thinking that they have to take tonic every day, even tonic like ginseng and red ginseng; the other is to blindly avoid eating poultry, eggs, fish and meat, which leads to serious nutritional imbalance. kiwi, watermelon, kelp, seaweed, seaweed, bitter melon, etc. Of course, if the patient is taking Chinese medicine, the prescribing doctor may have special instructions according to the composition of the drug, and the patient should follow them specifically.