Nutrition basics
Learning Center
Yerba mate: Is it safe to drink?
This herbal tea may help you feel more alert and focused, but find out what the possible health risks are.
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.
X-linked agammaglobulinemia
This genetic disease weakens the immune system, mainly in males, and leads to having infections often.
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.
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.
Whooping cough
Learn more about the symptoms, causes, treatment of this highly contagious, vaccine-preventable lung infection.
What is thirdhand smoke, and why is it a concern?
Tobacco smoke creates toxic residue that clings to walls, carpets, clothes and other surfaces.
Water: How much should you drink every day?
Know how much water to drink to stay healthy and hydrated.
Want a healthier dinnertime? Science says change your eating space
How and where you eat matters. From your plate size to your table, these expert-approved tips will help you navigate dinnertime like a seasoned pro.
Video: Baby's soft spots (fontanels)
A baby's soft spots (fontanels) close when the skull bones fuse together. See how.
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