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Learning Center
Video: An asthma attack
What happens to your airways during an asthma attack?
Video: Keratoconus
Scleral contact lenses may be an alternative to surgery for many patients with keratoconus.
Video: Migraine aura
A migraine aura is usually visual, but can also be a sensory, motor or verbal disturbance. This animation shows what happens when you have a migraine aura.
Vitamin D deficiency
What are the risks of too little vitamin D?
Vitamin D toxicity: What if you get too much?
Understand the risks of too much vitamin D, including a toxic reaction.
Vocal cord dysfunction: Is it a type of asthma?
Vocal cord dysfunction and asthma cause similar symptoms, but they're not the same. Find out the difference between the two.
Von Willebrand disease
Learn more about the symptoms, causes, diagnosis, treatment of this inherited bleeding disorder in which blood doesn't clot well.
Vulvar varicosities during pregnancy: What can you do?
Vulvar varicosities can cause discomfort during pregnancy. Understand what causes this form of varicose veins and learn how to get relief.
Wheezing
Wheezing: Symptom — Overview covers definition, possible causes of this symptom.
Whiplash
This common neck injury often is from a car crash. But other trauma can cause it too. Know the symptoms and how to treat it.
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