Chronic abdominal distension and excessive farting are not characteristic of cancer. There are many clinical causes for this condition and further examination is needed. Common dietary factors, intake of excessive gas-producing foods, such as soy products, gastrointestinal dysfunction, diabetes and patients who are bedridden for a long period of time, can lead to bloating and increased farting. In addition, some intestinal diseases, such as inflammatory bowel disease, irritable bowel syndrome and intestinal tumors, may also cause long-term abdominal distension and excessive farts. Although intestinal tumors can have the above symptoms in some cases, they are not unique symptoms and cannot be used to diagnose cancer. In case of long-term abdominal distension and excessive farts, it is recommended to improve the examination, such as gastroscopy and abdominal ultrasound, to clarify the cause of the disease, which can generally clarify whether the patient has gastrointestinal tumor. Long-term abdominal distension and excessive farts are not unique to cancer, but can be caused by many diseases.