Harvard Health Tips

Warning signs in diarrhea

If you experience diarrhea that lasts three days or more, call your doctor. Call immediately if there is blood in the stool or if the stool looks like black tar. The same goes for diarrhea accompanied by a fever over 101 F, severe abdominal or rectal pain, and severe dehydration (dry mouth, wrinkled skin, or lack of urination). …

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