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7 signs and symptoms not to ignore

4. Unexplained changes in bowel habits

What's considered normal for bowel movements varies widely. Consult your doctor if you notice unusual or unexplained changes in what's normal for you, such as:

  • Bloody, black or tarry-colored stools
  • Persistent diarrhea or constipation
  • Unexplained urges to have a bowel movement

Changes in bowel habits could signal a bacterial infection — such as campylobacter or salmonella infection — or a viral or parasitic infection. Other possible causes include irritable bowel disease and colon cancer.

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