Patients with gastric and esophageal cancers can live up to 5 years or longer after receiving regular treatment in time. However, if found to be advanced, the patient’s life can be prolonged by treatments such as chemotherapy, usually for a few months or 1-2 years, and the survival rate of esophageal cancer patients after treatment may be lower than that of gastric cancer patients. If both lesions exist, the patient is in better health and with better treatment, their life expectancy is extended to 5 years at most. However, gastric cancer and esophageal cancer will not develop at the same time, but may only lead to simultaneous development if the cancer cells metastasize. The life expectancy of gastric cancer and esophageal cancer depends on the patient’s physical quality and disease process, as well as the degree of protection in daily life. Generally speaking, if the patient is older or has poor health condition, he/she should not receive surgery and can only receive conservative treatment such as radiotherapy and chemotherapy, most of them cannot extend his/her life for a long time. If the patient is in good health, and the disease process is not advanced, the treatment is still early, and then after systematic and regular surgery and other comprehensive treatment, the life expectancy should be extended for several years.