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Learning Center
HPV infection: A cause of cancer in men?
Learn what types of cancer human papillomavirus can cause and how you can lower your risk.
HPV vaccine: Who needs it, how it works
Learn about how the HPV vaccine works, who needs it and what side effects to expect.
Hand-washing: Do's and don'ts
Done properly, hand-washing is a simple way to prevent the spread of germs and avoid getting sick.
Health issues for gay men and other men who have sex with men
Understand health concerns for gay men and other men who have sex with men, and learn how to promote good health.
Health issues for lesbians and other women who have sex with women
Understand health concerns for lesbians and other women who have sex with women, and take steps to promote good health.
Healthy sperm: Improving your fertility
You can take simple steps to have healthy sperm and improve your fertility.
Heart attack prevention: Should I avoid secondhand smoke?
It's possible that secondhand smoke can irritate the arteries and increase the risk of a heart attack.
Helping baby sleep through the night
Help your baby sleep through the night.
Herd immunity and COVID-19: What you need to know
To protect groups of people over time, it helps to know what level of recovery or vaccination in a population makes it hard for a germ to spread.
High-dose flu vaccines: How are they different from other flu vaccines?
High-dose flu vaccines are flu vaccines for older people.
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