There are many possible symptoms of bowel cancer, not necessarily 3. Common symptoms include abdominal discomfort or pain, abnormal bowel habit or fecal character, systemic symptoms, metastatic symptoms and so on. 1. Abdominal discomfort or pain: abdominal discomfort or pain is the most common symptom of bowel cancer. At the beginning, patients mostly show abdominal discomfort, abdominal distension or vague pain, which is inaccurate in localization but lacks specificity. When the disease progresses, abdominal metastasis occurs or causes acute intestinal obstruction, severe abdominal pain can appear. 2. Abnormal defecation habit and fecal character: including increased frequency of defecation, diarrhea, constipation, blood or mucus in feces, etc., but lack of specificity. 3. Systemic symptoms: patients with intestinal cancer can have a series of systemic symptoms due to malignant consumption, tumor infiltration and chronic blood loss, including emaciation, anemia, fatigue, edema, lymph node enlargement and so on. 4. Metastatic symptoms: Bowel cancer in late stage can have multiple metastases throughout the body, causing corresponding systemic symptoms, such as liver metastases, jaundice, liver enlargement, ascites, and bone metastases, which can cause severe pain or even pathologic fracture, etc. In early stage, there is no obvious specific symptoms. There are no obvious specific symptoms in the early stage of intestinal cancer, so early detection mainly depends on physical examination or screening. It is recommended that people with the above symptoms or family history of malignant tumors of the digestive tract should have regular physical examination and colonoscopy, so as to have early detection and treatment as soon as possible.