Blue is an unusual color for stool but it can occur. The main causes of blue stool are food colorings in certain foods, such as blue cordial drinks, blue colored sodas, and blue liqueurs. Blueberries are on the list, but they more commonly cause dark stool, purple stool, or black stool
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Note: This site is for informational purposes only and is not medical advice. See your doctor or other qualified medical professional for all your medical needs.