There are very many classifications of cancer. Some cancer patients may have a poorer diet, which leads to malnutrition, and in this case they will have general weakness. In addition, cancer is also a wasting disease, even though cancer patients do not do any exercise or do not do any work, but the consumption is still relatively high. At this time, patients may have nausea and vomiting during radiotherapy, and they may be reluctant to eat and have poor appetite, which may lead to poor nutrition, and this may also indirectly aggravate the general weakness. Other symptoms include anemia and hypoproteinemia, which may also lead to generalized weakness. Therefore, cancer patients need to eat less and more meals, increase nutrition, and appropriately supplement high-quality protein diet to improve body resistance, which also has the effect of relieving general weakness.