Staying healthy
Learning Center
Video: Rotator cuff damage
See how your rotator cuff can become damaged.
Digestion: How long does it take?
Digestion takes about two to five days, depending on your system.
Swallowing gum: Is it harmful?
Your body can't digest chewing gum. So what happens when you swallow it?
Scalp psoriasis vs. seborrheic dermatitis: What's the difference?
Learn how to tell apart these common conditions of the scalp, both of which cause inflamed, scaly skin.
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.
Premenstrual dysphoric disorder: Different from PMS?
Extreme moodiness, intense sadness or marked irritability in the days before your period — along with your usual PMS symptoms — could be PMDD.
Baby naps: Daytime sleep tips
Know when and how long babies need to nap, how to put them down for naps and how to handle fussiness.
How you hear
Your ears enable you to gather and interpret sounds from the world around you.
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).
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