What is the reason for bloody stool? I believe many friends with bloody stool symptoms will think about this question. Experts from Zhengzhou Huashan Anus and Intestine Hospital pointed out: Bloody stool is a common digestive disease, and there are many reasons for bloody stool, among which hemorrhoids, anal fissure, juvenile rectal polyps, and large intestine adenomas are more common. Friends with bloody stool symptoms should not be thinking by themselves, but should go to the hospital for examination and diagnosis in time to prevent misdiagnosis. Reasons for bloody stool: First, hemorrhoids are the most common cause of bloody stool. The bleeding is related to defecation, mostly after defecation or after stool in drops or jet-like, bright red color, sometimes accompanied by prolapse of hemorrhoids outside the anus and related discomfort, pain symptoms. Rectoscopy can see the hemorrhoid nucleus. Second, dysentery is an acute intestinal infectious disease caused by dysentery bacillus. The symptoms are abdominal pain, diarrhea, tenesmus, pus-blood stool, and may be accompanied by fever and other systemic infection symptoms. Symptoms disappear quickly after treatment. A few patients can have prolonged symptoms after treatment, forming so-called "chronic dysentery", with repeated diarrhea, mucus stool, pus-blood stool, bloody stool, etc., similar symptoms to colon cancer. Third, high-position bleeding in the digestive tract, such as bleeding caused by rupture of varicose veins at the lower end of the esophagus, bleeding from peptic ulcers, etc. Since the blood stays in the intestinal cavity for a long time after leaving the blood vessels, the stool appears tar-like when discharged from the body, black in color, or coffee-colored, in paste-like form, with positive occult blood in the stool. Fourth, low-position bleeding in the digestive tract, especially bleeding from the lower end of the colon and rectum, with bright red blood closely related to defecation. Among them, the characteristic of hemorrhoidal bleeding is that when straining during defecation, blood is discharged from the anus, with varying amounts, or blood on the toilet paper after defecation, or dripping blood, or in jet-like form. Anal fissure-induced bloody stool usually has less blood and is accompanied by severe pain. Rectal polyp bleeding is often seen in children whose stools stain the area around the anus. If it's an adult, the stool is mixed with blood and mucus and purulent secretions, with a foul smell, and the stool becomes thinner, one should be highly alert to the possibility of tumors in the rectum and lower segment of the colon. If the stool is mixed with blood and mucus, with tenesmus, increased frequency of bowel movements, and pain in the lower left abdomen, one should first consider dysentery and chronic enteritis. The harm of bloody stool cannot be ignored. Bloody stool easily causes a large amount of iron loss in the body, leading to iron deficiency anemia. It generally develops slowly, with no symptoms or mild symptoms in the early stage. When anemia is severe, symptoms such as pale complexion, fatigue, lack of appetite, palpitations, accelerated heart rate, shortness of breath and swelling after physical activity may appear. Some patients may even experience neurological symptoms such as irritability, excitement, and restlessness. At the same time, bloody stool is also an early signal of malignant tumors in the intestines. Since the situation of blood in the stool is similar to hemorrhoidal bleeding, it is difficult for ordinary people to distinguish between the two. Due to insufficient attention from some people, early malignant tumors are easily overlooked, leading to tragic consequences. Experts from Zhengzhou Huashan Anus and Intestine Hospital remind everyone that if bloody stool occurs, they should seek medical attention in a timely manner to avoid delaying serious conditions and causing serious consequences.