Stomach cancer is one of the common malignant tumors. Mr. Wang found out that his father unfortunately suffered from stomach cancer and had already suffered from loss of appetite, nausea and vomiting, and wasting. What is scary about gastric cancer is not the lump itself, but it will cause a series of reactions, which is often referred to as gastric cancer complications. So what are the reactions that patients with stomach cancer will have? 1. Weight loss. As the stomach content becomes smaller, the stomach’s feeding and digestion functions are affected, and the improper way of eating can cause nutrient and calorie deficiency, which makes the patient lose weight. 2.Anemia. Iron deficiency anemia is common in gastric cancer. Due to the reduction of gastric juice secretion and intestinal fluid reflux, gastric acid of gastric cancer patients is obviously reduced, which directly reduces the absorption of oral iron and causes anemia. 3.Low blood sugar. Glucose must be absorbed too fast in the small intestine after meal, which causes temporary increase of blood sugar and stimulates the increase of pancreatic secretion, followed by hypoglycemia. At this time, gastric cancer patients show palpitations, dizziness and cold sweat, which mostly occur 2-3 hours after meals. As one of the common tumor diseases, to improve the prognosis of gastric cancer, we need to maintain good diet and life health and regular medical checkup. Strive for early detection and treatment to achieve the best survival period. Conventional treatment of gastric cancer is as follows: Surgery: still the only effective treatment for gastric cancer. Radiation therapy: It is not very helpful for patients who are not suitable for resection, the reason is that anatomical localization cannot be performed. Radiotherapy can relieve the symptoms of pancreatic cancer obstruction and reduce the chronic bleeding of unresectable lesions. Chemotherapy: for progressive gastric cancer, surgery with chemotherapy; postoperative recurrence is applicable to the application of immunochemotherapy Special attention should be paid to the entire treatment process of gastric cancer in accordance with the principle of individualization, both to achieve the goal of eradication and to consider the quality of survival.