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This can be due to;
1) Rectal or colon polyp
2) Rectal growth
3) Anal sphincter spasm
4) Big internal hemorrhoids
All of these can change the caliber of the stool. An immediate examination is essential by doctor to rule out growth and polyp in rectum/colon. Your doctor may refer you to a gastroenterologist for a proctoscopy, sigmoidoscopy and colonoscopy examination.
Please feel free for your follow up questions.