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  1. Stool color: When to worry - Mayo Clinic

    Oct 10, 2024 · As bile travels through your digestive tract, it is chemically altered by enzymes, changing the colors from green to brown. Ask a healthcare professional if you're concerned …

  2. Gastrointestinal bleeding - Symptoms and causes - Mayo Clinic

    Oct 13, 2023 · Overt bleeding might show up as: Vomiting blood, which might be red or might be dark brown and look like coffee grounds. Black, tarry stool. Rectal bleeding, usually in or with …

  3. Rectal bleeding Causes - Mayo Clinic

    Dec 7, 2023 · Blood in your stool, on the toilet paper or in the toilet bowl can have various causes. See your doctor if it lasts more than a day or two.

  4. Blood in stool in adults - Mayo Clinic

    Find possible causes of blood in stool based on specific factors. Check one or more factors on this page that apply to your symptom.

  5. Rectal bleeding - Mayo Clinic

    Dec 7, 2023 · Your rectum makes up the lower portion of your large intestine. Rectal bleeding may show up as blood in your stool, on the toilet paper or in the toilet bowl. Blood that results …

  6. Colon cancer stool: What to look for and how to test at home

    Blood in your stool. You might see bright red blood or very dark, black, tarlike stool. Blood from lower down in your colon or rectum is usually red. Bleeding from higher up in the colon can …

  7. Rectal bleeding When to see a doctor - Mayo Clinic

    Dec 7, 2023 · Blood in your stool, on the toilet paper or in the toilet bowl can have various causes. See your doctor if it lasts more than a day or two.

  8. Undigested food in stool: What does it mean? - Mayo Clinic

    Oct 12, 2023 · Sometimes, you may see undigested food fragments in stool. This usually is high-fiber vegetable matter, which usually isn't broken down and absorbed in your digestive tract. At …

  9. Mucus in stool: A concern? - Mayo Clinic

    May 30, 2024 · A small amount of mucus in stool is usually nothing to worry about. Stool often contains a small amount of mucus. Mucus is a jellylike substance that your intestines make to …

  10. Pinworm infection - Symptoms & causes - Mayo Clinic

    Jul 23, 2025 · A pinworm infection is one of the most common worm infections worldwide. Pinworms are thin and white. They're about 1/4 to 1/2 inch — about 6 to 13 millimeters — …