If a patient with gastric cancer has not undergone surgery and tumor cells still exist, from the perspective of Chinese medicine, it is not recommended to eat sea cucumber in this case. Although sea cucumber is rich in protein, it is a cold food, so eating more sea cucumber will cause the body’s resistance to decline and make the tumor cells progressively aggravate. If the patient’s stomach cancer is in early stage, there is no tumor cell in the body after timely surgery, and the patient’s resistance decreases in the process of chemotherapy after surgery, the body’s resistance can be strengthened by eating protein-rich food, and in this case, a small amount of sea cucumber can be eaten to supplement nutrition. If the patient’s gastrointestinal function is weak and he or she is prone to abdominal pain, bloating and diarrhea after eating seafood, do not eat sea cucumber blindly. Therefore, whether patients with gastric cancer can eat sea cucumber or not depends on their own gastrointestinal function and severity of the disease. However, from the perspective of modern medicine, tumor patients do not need to abstain from eating foods that are rich in protein and help replenish the nutrition of the body.