Short answer, No: No, pencil thin stools are not caused by H pylori bacteria. You need a colonoscopy or appt. Pencil thin stools could be a sign of colon cancer or colitis (an inflammation or infection of your colon). Call and see your PCP and have them schedule you for a colonoscopy or GI consult. In the meantime, try probiotics. Your intestinal flora (good bacteria) may be imbalanced from those antibiotics.
Answered 8/19/2016
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