In terms of western medicine, there is no absolute contraindication, and what is usually called contraindication is actually the term used in Chinese medicine. Lung cancer patients can try to avoid eating the following foods: 1) foods that are harmful to the body, such as moldy foods, barbecued and smoked foods; 2) spicy and stimulating foods; 3) pickled foods, such as sauerkraut and pickles, because these foods are easy to get moldy in the process of making; 4) greasy foods; 5) foods with high iodine content, such as crabs, seaweeds, shrimps, etc., which are prone to cause the tumor breakage by eating these foods.