Lung cancer patients can eat fish, and there is no clinical statement about which kind of fish cannot be eaten by lung cancer patients, but it should be noted that if lung cancer patients are allergic to seafood, it is not recommended to eat fish, so as not to cause adverse consequences. Fish is rich in nutrients, contains high quality protein, and its fat content is relatively low. Lung cancer patients can consume fish in moderation, which can supplement the lack of nutrients to a certain extent and improve malnutrition. However, patients who are allergic to fish are not recommended to consume it, otherwise, allergic reactions such as diarrhea and red rash may occur, which may aggravate the physical discomfort of lung cancer patients and be unfavorable to disease control. Lung cancer patients need to pay attention to diets rich in vitamins, fibers and high quality proteins, such as fresh vegetables, fruits as well as milk and eggs, etc. Minerals can also be supplemented in moderation, which is conducive to the control and recovery of the disease.