Rectal cancer and internal hemorrhoids or mixed hemorrhoids are two common diseases with different degrees of damage to human health, both of which manifest with blood in the stool. It is possible to distinguish rectal cancer from hemorrhoids by the specific situation of blood in stool. Rectal cancer blood in the stool is often accompanied by changes in stool habits, while hemorrhoids blood in the stool is not accompanied by changes in stool habits. The change of stool habit is like frequent and incomplete bowel movement. Specific manifestations: more frequent stools than normal, but normal or little change in stool characteristics; no stool discharge or only a small amount of stool discharge, and a small amount of mucus and blood. In rectal cancer, the amount of blood in stool is usually small, bright red, and can not be mixed with stool; while the blood in stool of internal hemorrhoids or mixed hemorrhoids is mostly painless, intermittent, bright red blood after stool, mostly blood in stool or on stool paper, and sometimes when the stool is dry, constipated or too hard to defecate, there will be dripping or spraying blood in stool, and the blood in stool can often stop on its own after several days. When rectal cancer and hemorrhoids are suspected to exist at the same time, it mainly depends on whether there is any change of stool habit, and the change of stool habit indicates the possibility of rectal cancer. 3/4 of rectal cancers in China are low to medium rectal cancers, which means that 3/4 of rectal cancers can be palpated through rectal finger examination. For patients with blood in stool who do not have a palpable rectal mass but have blood in the finger sleeve, further endoscopic examination should be done. Blood in the stool Abnormal stool, be alert to colorectal cancer Because early symptoms of colorectal cancer are easily confused with other diseases, treatment is often delayed, and when it is found, it is already in advanced stage, and the prognosis is very poor. Therefore, early diagnosis and early treatment are the keys to improve the survival rate of colorectal cancer patients. Common symptoms of colorectal cancer include: 1. Blood in stool. This is one of the early symptoms of colorectal cancer, but the time and nature of colorectal cancer differs from one part to another. Patients with rectal cancer can have blood in stool in early stage, which can be fresh blood and often confused with hemorrhoids. The bleeding from other parts of the tumor sometimes cannot be detected by naked eyes due to the small amount of blood or long stay in the body, but the stool occult blood test is positive, and even serious anemia may appear in a long time. 2. Change of stool habit. It includes the change of stool time and frequency, as well as constipation or unexplained diarrhea. Patients with rectal cancer may have more frequent stools, but not many stools each time, and may discharge some mucous jelly-like liquid and have the feeling of incomplete defecation. Some patients can have repeated alternating constipation and diarrhea. When the disease develops further and the tumor in the intestinal cavity blocks the lumen, abdominal pain, abdominal distension, nausea and vomiting, stopping defecation and exhaustion and other intestinal obstruction manifestations may appear. 3. Abnormal shape of stool. Normal stool is cylindrical in shape, but if the cancer protrudes in the rectal cavity and presses the stool, the stool will often become thinner when it is discharged, and it can also be flattened, and sometimes there are blood marks attached.