The health of the intestinal tract is essential to the health of the body. As an organ of the vital digestive system, it absorbs nutrients, draws in water, and forms and expels stools and toxins. Blood in the stool is a common disorder of the intestinal tract, and it is both a symptom of a number of diseases, including hemorrhoids, and can be a red flag for malignancy. If you simply think that blood in the stool is hemorrhoids and take it lightly, the condition can be delayed in the slightest case, and in the worst case, the body will cause serious damage. There is a patient, repeated blood in the stool for nearly five years, was treated as hemorrhoids for nearly five years. During this time, a doctor once advised him to do a colonoscopy to clarify the diagnosis, were rejected by him. He also said to the doctor, “Nine out of ten people have hemorrhoids, now there are a few people who do not have hemorrhoids.” Later, the blood in the stool aggravated, appeared serious anemia, only to the hospital to do a colonoscopy, only to find out is the rectum and sigmoid colon junction of a polyp, the pathology of the polyp confirmed that the polyp has been cancerous. Finally, surgery to remove a large section of the intestine. The doctor shook his head and sighed, “Five years of delay, there would have been enough time to avoid the polyp from becoming cancerous. What a painful lesson!” For this reason, it is necessary to understand the basic medical knowledge of common diseases related to blood in the stool, so that we can be more vigilant, early prevention and treatment of intestinal disorders, to protect the intestinal tract and the body’s health and improve the quality of life. Hemorrhoids from the outside looking at the anus has a small meat protrusion. Is the end of the rectum, mucous membrane and anal canal subcutaneous veins and anal canal subcutaneous venous plexus varicose and form soft venous mass, the Department of rectal varicose veins, caused by the upper and lower rectal venous plexus. Hemorrhoids according to the occurrence of different parts, divided into internal hemorrhoids, external hemorrhoids, mixed hemorrhoids three. The cause of hemorrhoids is due to gravity and organ compression, venous blood due to obstruction is not easy to return, the formation of thrombus stagnation. Secondly, genetic factors, long standing, sitting, squatting, constipation, excessive alcohol consumption and eating spicy food. In addition, suffering from diseases, such as cirrhosis of the liver, heart disease, intra-abdominal tumors, anal infections and other factors can cause hemorrhoids. Hemorrhoids are a common and frequent disease with bleeding as the main clinical manifestation. Fresh blood is often mixed with feces when relieving stool, sometimes accompanied by hemorrhoidal nuclei prolapse, the formation of edema, embedded pain can occur, severe hemorrhoids patients can lead to anemia. Hemorrhoids in the treatment of surgical effect is better, such as hemorrhoids on the mucous membrane ring excision anastomosis (PPH). In recent years, the applied sclerotherapy injection, ligation, laser therapy, etc. also have certain efficacy. Hemorrhoids triggered by the main factors related to diet and lifestyle habits, diet should pay attention to: eat less spicy food, such as chili, mustard, pepper, strong alcohol, greasy, fried, seafood and cold food. You should eat more fresh vegetables, fruits, coarse and fine grains. Adopt good living habits, and combine work and rest. It is not easy to lift heavy objects, sit or squat for a long time. Stool should develop the habit of regular solution, squatting is not easy too long. Must also prevent constipation, constipation will cause acute attacks of hemorrhoids. Anal fissure, that is, the anal canal part of the mucous membrane repeated infection or mechanical damage and the formation of ulcers, after a long time, in order to stool bleeding, the amount of less and severe pain, periodic for the main performance. Anal fissure can exist in combination with hemorrhoids. Treatment can be silver nitrate wound cauterization and local closure and other means. When the symptoms are mild, oral laxatives and paraffin oil can be taken to keep the bowels unobstructed and make it heal by itself. Intractable anal fissure can be treated with surgery. Rectal and sigmoid polyp is a lesion of the mucosal surface of the rectum or sigmoid colon bulging toward the intestinal lumen. Fresh blood or dark red blood after stool is often stained outside the stool, rectal polyps are occasionally accompanied by polyp prolapse. This disease is prone to malignant transformation, and after clear diagnosis, endoscopic high-frequency electrocautery or other surgical methods should be adopted as early as possible to remove polyps to prevent cancerous transformation. Rectal cancer refers to the malignant tumor from the dentate line to the sigmoid junction, which is closely related to local chronic inflammatory lesions, carcinogenic substances and adenomas. Clinically, it is manifested as resolving mucus, pus and blood stools, and the stools of advanced rectal cancer have bad odor. At the same time, there are symptoms of defecation discomfort such as urgency and heaviness, deformation of stools and systemic discomfort such as emaciation, malnutrition and weight loss. This disease can be clearly diagnosed through anal examination, proctoscopy, colonoscopy and pathological examination. Rectal cancer should be treated by early surgery and consolidated with chemotherapy, immunization and traditional Chinese medicine. In addition to the above diseases, there are many other diseases such as inflammation, tumor, vascular disease, bleeding disease, systemic disease, mechanical cause and so on can lead to blood in stool. Therefore, when you find blood in stool, you should seek early medical treatment for diagnosis and treatment to protect your health.