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Viral gastroenteritis (stomach flu)

This condition, often called stomach flu, is usually harmless, except for infants and people with…

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Viral hemorrhagic fevers

Learn about the symptoms, treatment and prevention of these sometimes deadly diseases.

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Virtual colonoscopy

Unlike other colon cancer screening tests, this imaging test doesn't use a scope to examine…

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Vitamin A

Explore the uses of vitamin A and risks of excess use of this supplement.

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Vitamin B-12

Know the causes of a vitamin B-12 deficiency and when use of this supplement is…

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Vitamin B-12 and depression: Are they related?

Low levels of vitamin B-12 and other B vitamins may be linked to depression, but…

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Vitamin B-12 injections for weight loss: Do they work?

Vitamin B-12 injections — A weight-loss shot sounds appealing, but does it work?

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Vitamin B-6

Understand when a vitamin B-6 deficiency might occur and learn the risks of taking too…

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Vitamin C

Vitamin C is an essential nutrient found in foods and available as a supplement you…

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Vitamin-D

Learn how this supplement affects bone health and other health conditions. And know the possible…

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Vitamin D and MS: Is there any connection?

Some research suggests that vitamin D may reduce the risk of multiple sclerosis (MS).

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Vitamin D deficiency

What are the risks of not having enough of this vitamin?

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Vitamin D deficiency: Can it cause high blood pressure?

Too little vitamin D is bad for the bones, but what about the heart? Learn…

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Vitamin D for babies: Are supplements needed?

A Mayo Clinic specialist explains why, when and how to give your baby vitamin D.

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Vitamin D toxicity: What if you get too much?

Understand the risks of taking high doses of this vitamin in supplement form.

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Vitamin deficiency anemia

A lack of folate and vitamin B-12 can cause red blood cells to become too…

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Vitamin E

Find out how this supplement might affect brain health and the possible risks of taking…

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Vitamins and supplements for fatty liver disease (MASLD)

Certain vitamins and supplements may help manage MASLD, also called NAFLD or fatty liver disease.…

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Vitamins for MS: Do supplements make a difference?

Can vitamin supplements improve MS symptoms?

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Vitiligo

Learn more about this condition in which your skin loses pigment cells, resulting in very…

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VLDL cholesterol: Is it harmful?

Like LDL cholesterol, this cholesterol is considered a type of "bad" cholesterol.

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Vocal cord dysfunction: Is it a type of asthma?

Vocal cord dysfunction and asthma cause similar symptoms, but they're not the same. Find out…

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Vocal cord paralysis

Find out more about this condition that happens when nerve signals that control the voice…

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Voice disorders

Learn more about the causes of common voice disorders, such as laryngitis and granuloma, and…

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Vomiting blood

Vomiting blood can be a symptom of a number of serious conditions. Find out what…

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Von Willebrand disease

Learn more about the symptoms, causes, diagnosis and treatment of this inherited bleeding condition that…

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Vulvar cancer

Learn about this rare cancer that forms on the skin that surrounds the urethra and…

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Vulvar varicosities during pregnancy: What can you do?

Vulvar varicosities can cause discomfort during pregnancy. Understand what causes this form of varicose veins…

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Vulvodynie

Learn about pain, burning and irritation of the vaginal area that doesn’t have a clear…

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Waldenstrom macroglobulinemia

Learn about this rare type of white blood cell cancer. Treatments include chemotherapy, targeted therapy,…

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