Dental care
Learning Center
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: HSG test for female infertility
Video animation shows the HSG test — an X-ray study to identify causes of female infertility.
Video: Fetal ultrasound
Fetal ultrasound provides a glimpse of your developing baby.
Video: Baby's soft spots (fontanels)
A baby's soft spots (fontanels) close when the skull bones fuse together. See how.
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.
Viagra for women: Does it exist?
Learn about medicines to treat problems with sexual arousal or sexual desire in women.
Vesicoureteral reflux
Learn about what happens if urine flows backward from the bladder. Usually found in children, this condition boosts the risk of urinary tract infections.
Vertebral tumor
Vertebral tumors grow in the bones of the spine, causing pain and weakening the spinal column. Read more about how they’re managed, and what to expect.
Ventricular septal defect (VSD)
In this heart problem present at birth, there is a hole between the two lower heart chambers. Know the symptoms and when surgery is needed.
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