A 17-year-old boy with stomach cancer can be treated by surgery in early stage, while in middle and late stage, he needs to be treated with chemotherapy and radiotherapy after surgery. If a 17-year-old boy suffering from stomach cancer is still in the early stage, he can have the diseased part removed by surgery; after the surgery, patients should take good care of the wound to avoid infection and inflammation. After the surgery, patients should avoid eating stimulating food, have a light diet, eat small and frequent meals, and take appropriate exercise to enhance their physical fitness. For gastric cancer patients in middle and late stages, they should be treated with chemotherapy after surgery, and patients can use chemotherapy drugs such as paclitaxel and epothilone under the guidance of doctors. Some patients also need local radiation therapy to kill tumor cells. As this disease is highly specialized, patients should go to regular hospitals for consultation as early as possible, determine the specific treatment plan under the guidance of doctors, and actively cooperate with the treatment to avoid deterioration of the condition.