Weight loss is not necessarily a sign of bowel cancer, and imaging and other related examinations are needed. Weight loss can be caused by a variety of reasons. Besides malignant diseases such as bowel cancer and stomach cancer, endocrine diseases such as hyperthyroidism and diabetes mellitus can also lead to weight loss, and normal people can also lose weight when they can control their diet. Therefore, weight loss does not necessarily mean bowel cancer. In addition to weight loss, bowel cancer can also present with other symptoms such as change in bowel habit, fecal occult blood, abdominal distension, abdominal pain, anemia and so on. The results of fecal occult blood test, tumor marker test, colonoscopy, CT and other imaging tests need to be integrated to determine whether it is bowel cancer. Therefore, it is recommended to consult a doctor for standardized diagnosis and treatment when necessary.