Second trimester
Learning Center
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.
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.
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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