Tween and teen health
Learning Center
Vitamin D deficiency
What are the risks of too little vitamin D?
Vitamin D and MS: Is there any connection?
Some research suggests that vitamin D may reduce the risk of multiple sclerosis (MS).
Vitamin B-12 injections for weight loss: Do they work?
Vitamin B-12 injections — A weight-loss shot sounds appealing, but does it work?
Vitamin B-12 and depression: Are they related?
Low levels of vitamin B-12 and other B vitamins may be linked to depression, but more research is needed.
Virtual colonoscopy
Unlike other colon cancer screening tests, this imaging test doesn't use a scope to examine your colon. Learn how it works and what to expect.
Viral hemorrhagic fevers
Learn more about the symptoms, treatment and prevention of these sometimes deadly diseases.
Viral gastroenteritis (stomach flu)
This condition, often called stomach flu, is usually harmless, except for infants and people with immunosuppression. Symptoms can usually be managed.
Video: Wrist and forearm stretches for the workplace
Forearm stretches can help prevent stiffness. Try these stretches at work.
Video: What is blood pressure?
Watch this video to see what your blood pressure reading means.
Video: What happens during obstructive sleep apnea?
Sleep apnea — Watch this video to see how snoring and obstructive sleep apnea occur.
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