lower abdominal pain and blood in stool

hello, I'm 21yrs old and having abdominal pain below the umbilical line. my stool is soft n number of motions per day is 2-3 times. I can see red thin pin like structures in my stool which float on water. but my stool routine examination report says NO frank blood or RBC is present. there is abdominal pain below the umbilicus line before sensation of defeacation which lasts fr sometime after def... click here to continue

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