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  1. Stool color: When to worry - Mayo Clinic

    Oct 10, 2024 · Stool color is generally influenced by what you eat as well as by the amount of bile — a yellow-green fluid that digests fats — in your stool. As bile travels through your digestive …

  2. Color blindness - Diagnosis and treatment - Mayo Clinic

    Jan 10, 2025 · Diagnosis If you have trouble seeing certain colors, an eye care professional can test for a color deficiency. Testing likely involves a thorough eye exam and looking at specially …

  3. Color blindness - Symptoms and causes - Mayo Clinic

    Jan 10, 2025 · Color blindness is an eye condition in which someone can't see the difference between certain colors. Though many people commonly use the term "color blind" for this …

  4. Urine color - Symptoms and causes - Mayo Clinic

    Oct 11, 2025 · Overview Regular urine color ranges from clear to pale yellow. But certain things can change the color. Foods such as beets, blackberries and fava beans can turn urine pink or …

  5. Albinism - Symptoms and causes - Mayo Clinic

    Dec 13, 2023 · Eye color can range from very light blue to brown and may change with age. With albinism, the colored parts of the eyes, called the irises, usually don't have enough pigment. …

  6. Doppler ultrasound: What is it used for? - Mayo Clinic

    Jul 3, 2025 · Doppler ultrasound is a noninvasive test that can be used to measure the blood flow through your blood vessels. It works by bouncing high-frequency sound waves off red blood …

  7. Moles - Symptoms and causes - Mayo Clinic

    Dec 15, 2023 · Moles, also known as nevi, are a common type of skin growth that vary in color, shape and size. While most moles are most often harmless, they rarely can become cancerous.

  8. 7 fingernail problems not to ignore - Mayo Clinic

    Jun 30, 2023 · Nail pitting is when small round depressions or notches appear in the nails. It's common in people who have skin disorders such as psoriasis and eczema. Nail pitting also …

  9. Colon polyps - Symptoms and causes - Mayo Clinic

    Blood can show up as red streaks in the stool or make stool appear black. A change in color also may be caused by certain foods, medicines or dietary supplements. Mucus in stool. Stool often …

  10. Echocardiogram - Mayo Clinic

    Nov 12, 2024 · An echocardiogram uses sound waves to show how blood flows through the heart and heart valves. Sensors attached to the chest and sometimes the legs check the heart …