Nutritional supplements
Learning Center
Vitamin D toxicity: What if you get too much?
Understand the risks of too much vitamin D, including a toxic reaction.
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 the difference between the two.
Vulvar varicosities during pregnancy: What can you do?
Vulvar varicosities can cause discomfort during pregnancy. Understand what causes this form of varicose veins and learn how to get relief.
What is wheatgrass? Why is it in my drink?
Wheatgrass is a popular addition to smoothies and other drinks. While it's a rich source of nutrients, it's not a disease cure-all.
Wheezing
Wheezing: Symptom — Overview covers definition, possible causes of this symptom.
Wheezing in children: Could it be asthma?
Wheezing in children may be a sign of asthma — but not always.
Whiplash
This common neck injury often is from a car crash. But other trauma can cause it too. Know the symptoms and how to treat it.
White patch on skin: A cause for concern?
A small white patch on skin may have several causes, including eczema, psoriasis and vitiligo.
Withdrawal method (coitus interruptus)
The withdrawal method — pulling the penis out of the vagina before ejaculation — isn't the most effective birth control. Learn about the pros and cons.
Yeast infection in men: How can I tell if I have one?
Yeast infections can occur in men, causing inflammation of the penis (balanitis). Learn what signs and symptoms could mean you have a yeast infection.
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