In the early stage of stomach cancer, patients will not have back pain, and only when the disease develops to the middle or late stage, some patients will have back pain. However, not all patients with gastric cancer have back pain symptoms, and many diseases may have back pain. If a patient has wasting, weakness, indigestion, blood in stool, coughing, stomach pain, etc., it may be the presence of stomach cancer, but it may also be other diseases. Many patients are already in the middle or late stage of gastric cancer when they find themselves unwell and go to hospital for examination, so it is recommended to have regular medical checkups in hospital for early detection of gastric cancer. The best way is to do gastroscopy to detect abnormalities in the body and examine them as early as possible to achieve early detection and early treatment.