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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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Avatar universal
I had severe lower back pain (mostly on left side) about six months ago.  I went for treatment with a chiropractor and also got x-rays.  X-rays showed that my lower back and hips were out of alignment and was causing pinched nerves and muscle spasms in my back.  Over the course of four months, I had regular treatments from chiropractor to correct my back.  Now I am pain free.  Interesting that your GI would consider a back injury.  I wonder if my back problems is what is causing the change in stool size.
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Avatar universal
I see a urologist next week.  However, this GI dr is now changing his tune a little and told my hubby that "maybe" this could all be caused by a fall I had two months ago.  Before he said "no".

So...I was wondering, have you had any kind of fall or accident lately where your lower back could be out?

Anyhow, let me know how your colonoscopy turns out.

Also, have you ever had any surgeries before (e.g. appendix or anything in you stomach or pelvic area)??
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Avatar universal
Glad to hear your colonoscopy was clear.  What is next for you? I'll let you know how mine goes.
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My stool were smaller in size too. But, now with a clear colonoscopy they are saying IBS or stress? So, I wouldn't get real alarmed at the change in stool size thing. It seems that can be caused by conditions other than colon cancer.

Linda J
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Avatar universal
Had the colonoscopy today--all clear.  The prep was a lot worse than the procedure.  

They still have not found a cause for this pain I have in my left side or the change in stools.  At this point, I am running out of ideas.

Let me know how yours turns out!!
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Avatar universal
They re-scheduled it--I have it this coming Monday--will let you know
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