Fitness basics
Learning Center
Blood in semen
Finding blood in your semen can be alarming, but the cause is usually benign. Find out possible causes and when to see a doctor.
Boot camp workout: Is it right for you?
Looking for a fitness challenge? If so, a boot camp workout might be for you.
Breast implants and cancer: Any connection?
Concerned about a link between breast implants and cancer? Get the facts.
Bruxism (teeth grinding)
Bruxism is a condition in which you grind, gnash or clench your teeth unconsciously when you're awake or while you're sleeping.
COVID-19 infections by race: What's behind the health disparities?
Understand how underlying health problems, the places where people live and work, and racism can affect who becomes severely ill with COVID-19.
COVID-19 vaccines for kids: What you need to know
Learn about the safety and effectiveness of COVID-19 vaccines for kids, the possible side effects, and the benefits of vaccination.
COVID-19: Who's at higher risk of serious symptoms?
Advanced age and some health conditions can raise the risk of serious COVID-19 (coronavirus disease 2019) illness.
Calcium supplements: A risk factor for heart attack?
Learn about the possible link between calcium supplements and heart attacks.
Cancer risk: What the numbers mean
The news is full of reports about cancer risk, but what does it all mean for you? Find out how to interpret cancer statistics.
Cellulitis: How to prevent recurrent episodes
Learn to treat and prevent recurrent cellulitis.
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