Lung cancer patients can always take nutritional injections, but this is not recommended. Most of the late stage of lung cancer will be unable to eat, and the body is in an extremely weak state, so it is necessary to take nutritional supplements by means of nutritional injection to maintain the body functions and operation. Although it is possible to inject nutritional liquid for a long period of time, the absorption is not very good in general, and the cost is also relatively high, so this is generally not recommended. After a period of time of injecting nutritional injection, if the condition improves and the patient can eat on his/her own, it is still recommended that the patient should eat less and more frequent meals, so as to let the intestines absorb the required nutrition by themselves, which is better in absorption rate and lower in cost.