Quit-smoking basics
Learning Center
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.
Video: Ankle sprain
How do you get an ankle sprain? Watch this video and find out.
Video: Baby's soft spots (fontanels)
A baby's soft spots (fontanels) close when the skull bones fuse together. See how.
Video: Heartburn and hiatal hernia
Watch this video to learn about heartburn and hiatal hernia.
Video: How irritable bowel syndrome affects you
Watch this irritable bowel syndrome video to learn how IBS can affect you.
Video: Smoking — Anatomy of nicotine addiction
This animation illustrates how smoking changes your brain, causing nicotine addiction.
Video: What happens during obstructive sleep apnea?
Sleep apnea — Watch this video to see how snoring and obstructive sleep apnea occur.
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.
Vitamin D deficiency
What are the risks of too little vitamin D?
Vitamin D deficiency: Can it cause high blood pressure?
Too little vitamin D is bad for the bones, but what about the heart? Learn how a low vitamin D level may affect blood pressure.
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