Bloody stool is a very common symptom of digestive tract diseases, and some people disagree. As everyone knows, the biggest hidden danger of bloody stool may be the signal of colorectal cancer. Especially the elderly, we must not treat hematochezia lightly. But it is either bloody stool or colorectal cancer, because bloody stool can be seen in many other digestive tract diseases, such as hemorrhoids, anal fissure, colon polyps and so on. Among these reasons, hemorrhoid bleeding or colorectal cancer is the most common in adults; The most common bleeding in children is polyp.

1, the blood of hemorrhoids is usually bright red, not mixed with feces, but attached to the surface of feces; It can also be manifested as blood drops before and after defecation, and in severe cases, it is jet-shaped, which mostly occurs when constipation is over.

2. There is less bloody stool in anal fissure, and most of them are found on toilet paper; Anal pain may accompany defecation, which makes patients afraid to defecate.

3. Polyps have no discomfort when they have bloody stool, and the stool is normal, and blood often adheres to the surface of the stool.

4. Colorectal cancer bloody stool is characterized by persistent and chronic bloody stool with mucus, mixed with feces, frequent defecation, and sometimes only partial blood or mucus is removed without feces. If the cancer is far from the anus, the incidence of hematochezia will be lower. About 80% of rectal cancer has bloody stool.

The early stage of colorectal cancer lacks specific manifestations, and some patients only show different degrees of habitual changes in stool and bloody stool, so they are often misdiagnosed as hemorrhoids. Therefore, if there is a continuous bloody stool or a positive fecal occult blood test, it is necessary to further check and rule out whether it is caused by colorectal cancer.

Anal digital examination is the simplest examination method, through which 70% of rectal cancer can be found. X-ray barium enema can find the enlargement of colon cancer in all segments; According to different tumor sites, we can also choose proctoscope, sigmoidoscopy and fibercolonoscopy to observe tumor tissues, and we can take a small amount of tumor tissues for pathological examination, which can clearly diagnose the nature of the lesions and provide treatment plans.