Fitness basics
Learning Center
COVID-19, cold, allergies and the flu: What are the differences?
Knowing if you have COVID-19, a cold, the flu or seasonal allergies isn't easy. Find out about the differences between these illnesses.
Can vitamin D protect against coronavirus disease 2019 (COVID-19)?
Find out what the research says about vitamin D and coronavirus disease 2019 (COVID-19).
Video: How to use a dry powder tube inhaler
Watch these step-by-step instructions for using a dry powder tube inhaler.
Video: Keratoconus
Scleral contact lenses may be an alternative to surgery for many patients with keratoconus.
Movement disorders
Learn about the different types of neurological conditions that affect movement.
Poison ivy and other summer skin irritants
Take a look at these bumps, bites and rashes. Find out what causes them and how they can be treated.
Inherited metabolic disorders
Caused by gene changes, these disorders affect the body's ability to change food into energy. They also affect how energy is used, such as for cell repair.
Which CPAP masks are best for you?
CPAP masks come in a variety of styles. See some of your options.
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