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Changes in stool shape

I am a male in my early forties, healthy, non-smoker, non-drinker, eats well.  Family has no history of colon cancer or polyps.  I have been treated for H-Pylori six years ago.
Two months ago, I began to experience loose stool.  My bowel movements were regular (once a day, sometimes two).  I also experienced increase in gas.  About three weeks ago, my stools began to go back to normal consistency but I noticed there was a change in the shape of the stool.  When I pass the stool, the first six inches would be a normal shape but then it would start to taper its shape to a rectangular shape of 1" x 3/8".  There is no blood in the stool.  I did have an occult blood test and a blood anemia test last week and they both came back negative.  I do not have any abdominal discomfort or pain.  My doctor also did a digital rectal exam and said everything looks good down there.  At this time, my doctor says to hold off with any other diagnostic exams (ie: Barium Enema or colonoscopy) to see if the symtoms change.  Would any kind of bacterial infection or Irritable Bowel Syndrome cause this kind of narrowing of the stool?  What else could cause narrowing of the stool?
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Colonoscopy is scheduled for June 30th.  How did yours turn out?
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Did you have your colonoscopy this week?
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Linda J.  What symptoms did you experience to warrant a colonoscopy?
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My colonocsopy has been rescheduled for this Friday.
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HI Thuney, meant to tell you not to worry too much about "smaller" stools. After my clear colonoscopy the doc said it can be caused by IBS or stress or even by internal hemorrhoids.

Linda J

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How did your colonoscopy go?  I have mine on Monday.  Let me know.  I am pretty scared since the pain is coming back again pretty good tonight.
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