Healthy diets
Learning Center
Video: Heart and circulatory system
Watch this video to see how a healthy heart works.
Video: How cancer spreads
Watch this video to see how cancer spreads (metastasizes).
Video: Melanoma — Early stage and advanced melanoma
Melanoma — Video explains early-stage melanoma and advanced melanoma.
Video: Ovulation
Ovulation — the release of an egg from an ovary — occurs about midway through the menstrual cycle. See how it happens.
Video: Rotator cuff damage
See how your rotator cuff can become damaged.
Walking pneumonia: What does it mean?
Walking pneumonia is a mild bacterial infection that resembles a cold. It usually does not require bed rest or a hospital stay.
Water after meals: Does it disturb digestion?
Drinking plenty of water helps keep your digestive system on track.
What is aspirin-exacerbated respiratory disease (AERD)?
AERD, also called Samter's triad, has three features: asthma, recurring nasal polyps, and sensitivity to aspirin and drugs such as ibuprofen and naproxen.
What is chikungunya fever, and should I be worried?
Learn more about this mosquito-borne virus — found in Africa, Asia, India, and parts of Europe and the Americas — that causes fever and severe joint pain.
What's the difference between H1N1 flu and influenza A?
H1N1 flu is a subcategory of influenza A.
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