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Blood in the stool should not be taken lightly.
The blood could have come due to injury to the rectum
while passing hard stool or it could be due to piles. These are not serious problems but there are other very serious causes for blood in stool
which can only be diagnosed by a Gastroenterologist who will have to do Colonoscopy
to rule out any serious problem.
Meanwhile drink plenty of water and eat fruits and vegetables to soften your stool.
Do consult a Gastroenterologist