Nutrition basics
Learning Center
Water: How much should you drink every day?
Know how much water to drink to stay healthy and hydrated.
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.
Video: Rotator cuff damage
See how your rotator cuff can become damaged.
Video: Ovulation
Ovulation — the release of an egg from an ovary — occurs about midway through the menstrual cycle. See how it happens.
Video: Melanoma — Early stage and advanced melanoma
Melanoma — Video explains early-stage melanoma and advanced melanoma.
Video: How cancer spreads
Watch this video to see how cancer spreads (metastasizes).
Video: Heart and circulatory system
Watch this video to see how a healthy heart works.
Video: 3 things you didn't know about cold sores
Cold sores on the lips can be embarrassing and tough to hide. Most people who are infected with the virus that causes cold sores never develop symptoms.
Vertebral tumor
Learn about these tumors that grow in the bones of the spine, causing pain and weakening the spinal column. Find out about diagnosis and treatment.
Vasectomy reversal
Learn about this microsurgery procedure that can restore your fertility after a vasectomy.
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