Cancer is a kind of wasting disease, and cancer patients may have weakness and increasingly weak feeling when they reach the end stage. It is the tumor development that leads to more powerful nutrient absorption, and patients may have poor appetite and poor feeding themselves, which will cause severe malnutrition, anemia, hypoproteinemia, etc. All these will cause patients to feel more weak. Therefore, it is necessary to strengthen nutritional support for cancer patients, which can be properly supplemented with high-quality protein, such as fish, eggs, protein powder, etc. If the decrease of food intake suggests possible disease progression, intravenous supplementation of nutritional fluid, such as fatty milk, amino acids and so on, is also available. In addition, anti-tumor treatment needs to be done for the cancer lesion itself.