Any persistant change in caliber of the stool should be evaluated for possible polyps or cancer. Being 58 years old and last having a
colonoscopy 5 years ago, you may want to consider repeating an endoscopy (either a
colonoscopy or flexible sigmoidoscopy) - although the chances of a new growth in 5 years is unlikely.
If negative, then irritable bowel syndrome can also cause a change in stool shape. However, before attributing the symptoms to this, you want to rule out cancer and polyps first.
A gastroenterologist would be the proper specialist to see.
And yes, I am a real doctor. More information about me can be found on my blog (kevinmd_b).
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
Medical Weblog:
kevinmd_b
as for diarhea (diarrhea),try eating yogurt,good one from healthfood store,not that dannon or store brand ****.