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A prolonged bleeding from rectum needs investigations and a physical examination by either a gastroenterologist or a surgeon. The common causes can be;
1) Hemorrhoids or piles
2) Anal fissure
3) Polyp rectum
5) Inflammatory bowel disease like crohn's disease
6) Growth in rectum or colon
Investigations needed to establish the cause are;
3) Barium enema
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Pain and bleeding may be indicative of anal fissure or inflamed piles. Still investigations are needed for establishing the cause.
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Ideally you should seek an appointment with a gastroenterologist. So a certain diagnosis can be made. Gastroenterologist would do proctoscopy on the appointment, as it is a office procedure and hemorrhoids, anal fissure and rectal polyp can be diagnosed.
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