Introduction: As one of the three routine examinations, stool examination (especially for children) is economical and practical, and has important diagnostic and therapeutic value. How do some people have red stools? What diseases can abnormal stool reflect? Dark red stool: it is dark red because of the uniform mixing of blood feces, also known as jam color. Common in amebic dysentery, colon polyps and colon tumors. In addition, some special diseases, such as thrombocytopenic epilepsy, aplastic anemia, leukemia, epidemic hemorrhagic fever, etc., can also lead to hematochezia due to the disorder of coagulation mechanism, which is generally dark red and sometimes bright red, and is often accompanied by bleeding of skin or other organs. Another situation is that normal people eat too much coffee, chocolate, cocoa, cherries, mulberry and so on, and dark red stool can also appear. Pale red stool: Like watery stool, this kind of stool is most common in summer because of eating some pickled products contaminated by halophilic bacteria. Diarrhea caused by salmonella infection is common. Bright red stool: common in lower gastrointestinal bleeding. There is a small amount of blood on the outer layer, accompanied by severe pain, which disappears after defecation, which is for anal fissure; If the blood color is bright red, the amount varies or appears as a blood clot, which is attached to the outer layer of feces and is not mixed with feces, the blood or blood clot can be washed away with water, which may lead to internal hemorrhoid bleeding. Another feature of hemorrhoid bleeding is that a small amount of blood is often dripped or ejected after defecation, and then stops automatically; If the blood is bright red and mixed with feces, it suggests that it may be caused by intestinal polyps or rectal cancer or colon cancer. The bloody stool of rectal cancer is often mixed with erosive tissue. The bloody stool of colon cancer is characterized by a small amount of blood, accompanied by a large amount of mucus or pus. Warm reminder from the Global Hospital Network: When there is red stool, you should carefully observe it for one or two days. If it is caused by a disease, you should go to the hospital for examination and treatment in time. In short, once there is blood in the stool, patients should go to the hospital in time to avoid delaying treatment. Further reading: diseases with abnormal stool reaction 1, gray stool, while the baby's white eyes and skin are yellow, which may be biliary obstruction or bile viscosity or hepatitis. 2, the stool is black, which may be caused by bleeding in the upper part of the stomach fire or taking iron drugs to prevent anemia. 3, the stool has bright red blood, which may be dry stool, or the skin around the anus is broken. 4. The stool is yellowish brown and watery, with nipple and pungent rotten egg smell, which is protein's indigestion. 5, the stool is light yellow, paste-like, oily in appearance, containing more milk flaps and fat droplets, floating on it, the amount of stool and the number of defecations are more, which may lead to fat indigestion.