Fitness basics
Learning Center
Hay fever: How to avoid triggers
If you have hay fever, the best thing you can do is to take steps to lessen your exposure to allergens, such as pollen and mold spores: 1. Close doors and windows during pollen season. 2. Use air conditioning in your house and car. 3. Avoid outdoor activity in the early morning, when pollen counts are highest, and also on high pollen-count days. 4. Use a dehumidifier to reduce indoor humidity. 5. Use a high-efficiency particulate air (HEPA) filter in your bedroom.
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.
Heart rate: What's normal?
A normal resting heart rate for adults ranges from 60 to 100 beats per minute. A heart rate above or below that may signal a problem.
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.
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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