Consumer health basics
Learning Center
Vitamin D toxicity: What if you get too much?
Understand the risks of too much vitamin D, including a toxic reaction.
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.
Vitamin D deficiency
What are the risks of too little vitamin D?
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.
Video: What happens during obstructive sleep apnea?
Sleep apnea — Watch this video to see how snoring and obstructive sleep apnea occur.
Video: Using a metered dose asthma inhaler and spacer
Watch this video to see how to use a metered dose asthma inhaler and spacer.
Video: Smoking — Anatomy of nicotine addiction
This animation illustrates how smoking changes your brain, causing nicotine addiction.
Video: How to use a single-dose dry powder inhaler
Watch these step-by-step instructions for using a single-dose dry powder inhaler.
Video: How to use a peak flow meter
Asthma attacks taking you by surprise? Take regular peak flow meter readings, as shown in this video, to predict asthma episodes and better control your condition.
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