Colon cancer at age 15 may be related to genetics, diet, etc. Colon cancer is a common malignant tumor of the digestive tract that occurs in the colon area. Any age can get colon cancer, and its development is mainly related to heredity, diet and other factors. Colon cancer disease is highly hereditary, which can be an important cause of colon cancer in adolescents. Some familial tumor syndromes, such as hereditary nonpolyposis colon cancer, can significantly increase the chances of causing the onset of colon cancer etiology, thus leading to the onset of the disease at a much younger age. Secondly, the incidence of colon cancer is also related to dietary habits, such as excessive intake of pickled, high-fat food and insufficient intake of fiber, because unhealthy dietary habits may stimulate the gastrointestinal tract, such as often drinking alcohol or eating spicy and stimulating food in normal times may increase the chances of developing colon cancer. Low exercise, mental, psychological and social factors may also lead to colon cancer in teenagers. When the disease occurs, it is necessary to consult the hospital for timely treatment and pay attention to the dietary regulation in normal life.