Long-term stools with one grain are mostly considered as gastrointestinal dysfunction, intestinal polyps and other diseases. Some patients with bowel cancer may also have the above symptoms, so specific analysis is needed. Long-term grainy stool is usually due to the lack of water in the body, and the water in the stool is reabsorbed through the large intestine, which then leads to dry and hard stool, resulting in a grainy situation. Bowel cancer is mostly manifested by changes in stool characteristics and frequency of bowel movement, such as sudden thinning of stool for a period of time, increase in frequency, or blood in the process of stool discharge, which can be accompanied by abnormal weight loss, unexplained weight loss and hidden pain. In addition, patients should ensure good living habits, regular diet and avoid eating spicy and greasy food, especially unhygienic food, to help reduce the occurrence of bowel cancer.