Fitness basics
Learning Center
Can vitamin D protect against coronavirus disease 2019 (COVID-19)?
Find out what the research says about links between this key vitamin and the widespread viral infection.
COVID-19 variants: What's the concern?
The virus that causes COVID-19 has changed over time, which has affected prevention, diagnosis and treatment of COVID-19.
COVID-19 infections by race: What's behind the health disparities?
Understand how underlying health conditions, the places where people live and work, and racism can affect who becomes seriously ill with COVID-19.
CA 125 test: A screening test for ovarian cancer?
Learn why health care providers generally don't recommend a CA 125 test for ovarian cancer screening.
Breastfeeding strike: Why do babies refuse to nurse?
Understand why babies sometimes refuse to breastfeed and what you can do about it.
Blood clots during menstruation: A concern?
Blood clots during menstrual periods aren't always a cause for a concern. But passing large clots may be a sign that something is wrong.
Bleeding after menopause: A concern?
It's unusual to bleed from the vagina after menopause. Learn what health problems can cause it and why you need to see your health care provider.
Bladder outlet obstruction: Causes in men?
Find out more about the causes of male bladder outlet obstruction and possible next steps.
Bladder infection in men
Although women are more likely to get bladder infections, men can get them, too. Learn about signs and symptoms and what could put you at risk.
Baby teeth: When do children start losing them?
Losing baby teeth is a big childhood event. Find out what to expect.
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