Hi,
Brown coloured usually may be even normal because of a little high billirubin content in stools. But there is also occult blood in stools so the blood must be coming from some place(intestines,stomach,duodenum) and it has been seen by a endoscopy that your oesophagus and stomach and duodenum are normal,now there can be blood from other sites, from lower gastro intestinal tract (colon,rectum).
However if the occult blood is less or if it does not come again then you might not worry about it ...
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