Fitness basics
Learning Center
Ejection fraction: What does it measure?
This measurement, commonly taken during an echocardiogram, shows how well the heart is pumping. Know what results mean.
Atypical cells: Are they cancer?
Atypical cells appear abnormal, but they aren't necessarily cancerous.
Small cell, large cell cancer: What this means
Cancer cells are classified by how they look under a microscope. Learn common terms used to describe cancer cells.
Autism spectrum disorder and digestive symptoms
Children with autism spectrum disorder often have other health issues, including problems related to digestion.
Is a home sperm test useful?
Using a home sperm test to check your fertility may not provide a clear answer.
Cervical dysplasia: Is it cancer?
Learn what to expect if a Pap test shows cells that look different from typical cervical cells. Follow-up tests might include HPV testing and colposcopy.
Recurring strep throat: When is tonsillectomy useful?
Tonsillectomy may sometimes be needed in children who have recurring strep throat infections.
Flu shots for kids: Does my child need a flu shot?
Know the latest recommendations for children's flu vaccines.
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.
Pap smear: Do I need one if I'm a virgin?
Doctors recommend regular cervical cancer screening whether you've had sex or not.
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