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Causes of blood in the stool range from harmless, annoying conditions of the gastrointestinal tract such as hemorrhoids and anal tears from straining against hard stools with constipation to serious conditions such as cancer. Blood in the stool should be evaluated by a health-care professional. Rectal bleeding (known medically as hematochezia) refers to passage of bright red blood from the anus, often mixed with stool and/or blood clots. Most rectal bleeding comes from the colon, rectum, or anus.
Bloody stool is often a sign of gastrointestinal bleeding due to injury or disease. Stools that contain bright red or maroon-colored blood may be referred to as hematochezia, while melena is used to describe black, tarry, and smelly stools.Bloody stool can occur in all age groups and populations. Blood in the stool can appear in a variety of forms.There may be small amounts of bright red blood that is mixed inside the stool or that shows up on toilet paper after wiping the anus.Visible blood clots can also be present.loody stool can occur in all age groups and populations. Blood in the stool can appear in a variety of forms. There may be small amounts of bright red blood that is mixed inside the stool or that shows up on toilet paper after wiping the anus. Visible blood clots can also be present.