Quit-smoking basics
Learning Center
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 heart for life: Avoiding heart disease
Preventing heart disease begins with small steps. Find out more about maintaining a healthy heart.
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.
Heat and exercise: Keeping cool in hot weather
Use these tips to avoid problems when exercising outdoors in hot weather.
Helping baby sleep through the night
Help your baby sleep through the night.
Hemangioma
This red mark on a baby's skin looks like a rubbery bump or flat red mark and is made up of extra blood vessels in the skin. It generally goes away by age 10. Learn more about its causes and treatment.
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.
Home safety tips: Preparing for Alzheimer's caregiving
Understand the home safety tips that can help prevent harm to a loved one with Alzheimer's disease.
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