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7 signs and symptoms not to ignore

4. Unexplained changes in bowel habits

What's considered typical for bowel movements varies widely. Consult your health care provider if you notice unusual or unexplained changes in your bowel movements, such as:

  • Bloody, black or tarry-colored stools
  • Persistent diarrhea or constipation
  • Pain in the stomach that doesn't go away

Changes in bowel habits could be a sign of 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.