A vague pain in the stomach may be a precursor of cancer, but it is not absolute because some digestive diseases or cold can cause a vague pain in the stomach. If you are worried about your health condition, you can go to a local professional hospital for cancer screening as soon as possible to rule out cancer factors first, and your doctor will also give you the corresponding examination plan and treatment methods. Cancer is usually asymptomatic in the early stage, and when patients find symptoms, they are basically in the middle or late stage. Therefore, they should have a regular physical examination once a year to keep track of their health condition so as not to delay the disease and cause more harm to their body. Although it is difficult to prevent cancer at present, the effect of early treatment is relatively good. If cancer patients are confirmed to be cancer patients, they do not need to worry too much. During the treatment period, they must maintain a peaceful state of mind and cooperate with doctors for treatment, only in this way can they better control the disease and prolong their survival period.