Fitness basics
Learning Center
Hyperinflated lungs: What does it mean?
If you can’t breathe out well, as in COPD, air may get trapped inside your lungs. As you breathe in more air over time, your lungs get too big and stiff.
How fit are you? See how you measure up
Determine your fitness level with this simple fitness assessment.
High-risk pregnancy: Know what to expect
Find out what to expect during a high-risk pregnancy and learn steps you can take to stay healthy.
High blood pressure dangers: Hypertension's effects on your body
If blood pressure stays high, it can cause other health conditions. Find out more about these complications.
High blood pressure and sex: Overcome the challenges
High blood pressure may affect sex. Talking openly with a health care provider about problems and possible solutions can help.
Hepatitis C: What happens in end-stage liver disease?
End-stage complications of hepatitis C include liver failure and liver cancer.
Hepatitis C
Many people with this infection don't know they have it. Find out about symptoms and treatment for this liver disease that can be dangerous.
Hemolytic uremic syndrome (HUS)
Damage to the small blood vessels in the kidneys can cause clots that clog the organ's filtering system. This can lead to life-threatening kidney failure.
Heat and exercise: Keeping cool in hot weather
Use these tips to avoid problems when exercising outdoors in hot weather.
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.
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