What is rectal bleeding (hematochezia)?
Rectal bleeding (known medically as hematochezia) refers to the passage of red blood from the anus, often mixed with stools and/or blood clots. (It is called rectal bleeding because the rectum lies immediately above the anus, and although the bleeding indeed may be coming from the rectum, as discussed later, it also may be coming from other parts of the gastrointestinal tract.) The severity of rectal bleeding (i.e., the quantity of blood that is passed) varies widely. Most episodes of rectal bleeding are mild and stop on their own. Many patients report only passing a few drops of fresh blood that turns the toilet water pink or observing spots of blood on the tissue paper. Others may report brief passage of a spoonful or two of blood. Generally, mild rectal bleeding can be evaluated and treated in the doctor's office without hospitalization or the need for urgent diagnosis and treatment.