Gastric cancer back pain may be caused by tumor metastasis, lumbar disc herniation, lumbar muscle strain, etc. Patients need to consult doctor in time to clarify the cause of the disease. Gastric cancer is a common malignant tumor of digestive system caused by Helicobacter pylori infection, bad dietary habits and other factors. When the disease develops to the late stage and lumbar metastasis occurs, it can lead to the symptoms of lumbar pain. At this time, radiotherapy and other methods can be used for timely treatment to improve the quality of life and prolong the survival period of patients. In addition, stomach cancer patients with back pain can be caused by non-cancer factors such as lumbar disc herniation and lumbar muscle strain. Therefore, patients with back pain should go to hospital for standardized diagnosis and treatment as soon as possible to avoid delaying their condition.