Since rectal cancer is often clinically asymptomatic or without specific symptoms in the early stage, people do not pay enough attention to the early manifestations of rectal cancer. With the improvement of our living standard and the pollution of the surrounding environment, the incidence of rectal cancer in our city has increased accordingly. And many people have increased stool frequency with a small amount of mucus and blood very early, thinking that they are hemorrhoid attacks, they do not put it into their mind and still insist on going to work, but they miss the highest time of diagnosis and treatment, and often when they are diagnosed with colorectal cancer, it has already reached the middle and late stage. The early symptoms of rectal cancer are often atypical and easy to be misdiagnosed. We should pay attention to whether we have any suspicious symptoms and raise our vigilance. For example: 1. Blood in stool or black stool. 2.Pus and blood in stool or mucus and blood stool. 3, alternating diarrhea and constipation. 4.Changes in stool habits, with increased frequency or urgency. 5. Change in stool shape, becoming thinner and flatter. 6.Lumps in the anus or abdomen. 7. Abdominal distension, abdominal pain, indigestion, loss of appetite. 8.Anemia of unknown origin. 9.Sudden weight loss. 10.Multiple polyps or papillary adenomas are found. When the above symptoms appear, you should go to the hospital promptly. Generally speaking, the surgeon can detect rectal tumor by anal finger examination. In addition, proctoscopy or colonoscopy, biopsy of suspicious lesions and pathological characterization can clarify the diagnosis of rectal cancer.