This means that there is bleeding from the rectum/lower GIT(gastro intestinal tract).The condition having fresh red colored blood from anus is called hematochezia. Generally, the closer the bleeding site is to the anus, the blood will be a brighter red. This blood is coming from lower gastro intestinal tract.Its most common causes are hemorrhoids,anal fissures,diverticular bleeding,intestinal infection (such as bacterial enterocolitis),inflammatory bowel disease,ulcerative collitis,crohn's disease.
You need:stool examination,ultrasound of lower abdomen.It should be evaluated by a health care professional.So I advice you to see your doctor for the examination,tests & treat according to the cause.
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