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Learning Center
What is chikungunya fever, and should I be worried?
Learn more about this mosquito-borne virus — found in Africa, Asia, India, and parts of Europe and the Americas — that causes fever and severe joint pain.
What is thirdhand smoke, and why is it a concern?
Tobacco smoke creates toxic residue that clings to walls, carpets, clothes and other surfaces.
What's the difference between H1N1 flu and influenza A?
H1N1 flu is a subcategory of influenza A.
When to brush your teeth
When should you brush your teeth? Learn how to protect your oral health.
White coat hypertension: When blood pressure rises in a medical setting
Blood pressure that measures high during a health checkup could be a risk factor for high blood pressure. Find out more.
White patch on skin: A cause for concern?
A small white patch on skin may have several causes, including eczema, psoriasis and vitiligo.
White stool: Should I be concerned?
White stool may mean a serious liver problem. Learn about causes.
Whole-body vibration: An effective workout?
Whole-body vibration — Don't give up regular exercise and a healthy diet.
Why isn't there a hepatitis C vaccine?
Hepatitis C vaccine development is far from straightforward, but experimental vaccines are under study.
Wisdom teeth removal: When is it necessary?
You may not need your wisdom teeth taken out if they're healthy and in the right place. But if they cause problems, your dentist may suggest removing them.
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