Most cancer patients can eat some shiitake mushrooms appropriately, because shiitake mushrooms are rich in proteins, amino acids, vitamins, trace elements and other nutrients, which can provide nutrients to the human body after consumption. Meanwhile, the crude fiber and other elements in shiitake mushroom can promote gastrointestinal peristalsis and accelerate food digestion to relieve constipation and other indigestion symptoms during the course of the disease, but people who are allergic to shiitake mushroom should be prohibited from eating it. Cancer patients should consume more low-fat and high-protein foods, such as milk, eggs, fish, etc., and also choose more vitamin-rich fresh fruits and vegetables. In addition to the choice of food, attention should be paid to light cooking and try not to consume spicy and stimulating food. Patients are advised to formulate a suitable dietary plan under the guidance of specialists and dietitians, and to seek prompt medical attention if they feel unwell.