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  1. Your doctor will complete a physical examination and consider your medical history when determining the cause of your diarrhea. They may also request laboratory tests to examine urine and blood samples.

    Additional tests your doctor may order to determine the cause of diarrhea and other related conditions can include:

    fasting tests to determine whether a food intolerance or allergy is the cause
    imaging tests to check for inflammation and structural abnormalities of the intestine
    a stool culture to check for bacteria, parasites, or signs of disease
    a colonoscopy to check the entire colon for signs of intestinal disease
    a sigmoidoscopy to check the rectum and lower colon for signs of intestinal disease
    A colonoscopy or sigmoidoscopy is especially helpful for determining if you have an intestinal disease if you have severe or chronic diarrhea.

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