Toddler health
Learning Center
Why interval training may be the best workout at any age
High-intensity interval training (HIIT) may provide more benefits for older exercisers than the young and fit. Learn how to harness the power of intervals whatever your age.
Why isn't there a hepatitis C vaccine?
Hepatitis C vaccine development is far from straightforward, but experimental vaccines are under study.
Wilson's disease
This inherited disease causes copper to build up in vital organs, especially the liver, brain and eyes. It's treatable when caught early.
Winter blahs? 4 pro tips to get you off the couch.
Struggling to stay active in winter? We've got you covered with some inside tips and strategies that'll help you keep moving.
Winter doesn't mean you can sideline the sunscreen
It's as easy to get sunburned in winter as in summer. Snow reflects the sun's rays, so sunburn is possible even if you're cold. When you're outdoors in the winter, wear sunscreen on any exposed areas. Use lip balm that contains sunscreen, too.
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.
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.
Wolff-Parkinson-White (WPW) syndrome
This heart condition present at birth causes a fast heartbeat. Rarely, it can cause sudden cardiac death. Know the symptoms and how it's treated.
Women's health: Prevent the top threats
Find out how to prevent the top women's health risks, including heart disease, stroke and cancer.
Women's sexual health: Talking about your sexual needs
Women's sexual health — Tips for talking about your sexual needs and achieving fulfillment.
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