Why does shit bleed?

Stool bleeding is very common, some with blood in the stool, blood and stool mixed together, this case is often gastrointestinal bleeding, from the mouth to the anus of the digestive tract bleeding anywhere may cause stool with blood. Upper gastrointestinal bleeding, such as stomach, esophagus or duodenum, blood mixed with stool, black color, such as bleeding can be manifested as tarry stool. If the lower part of the digestive tract bleeding, such as near the rectum, anus, stool color may not be too black, generally stool color is red, can be accompanied by mucus, pus blood. If hemorrhoids, anal fissure caused by bleeding, often blood with stool and out, no stool when there is no blood. When bleeding can be dripping or spraying. There are many causes of hematochezia, the most common is some local diseases of the anus and rectum, such as hemorrhoids, anal fissure or rectal polyps. In addition, rectal ulcers and rectal malignant tumors can also cause hematochezia.