Fitness basics
Learning Center
Urinalysis
This common lab test checks urine for signs of disease and for clues about overall health.
Uterine polyps
Tissue growths inside the uterus can cause abnormal uterine bleeding or infertility. Learn about tests and treatment.
Vaginal agenesis
In this rare condition that occurs before birth, the vagina doesn't develop and the uterus may only develop partially or not at all. Learn about treatment.
Vascular rings
Learn more about this condition in which malformations of the aortic arch encircle the windpipe and esophagus and can press against them.
Ventricular fibrillation
Without fast treatment, this heart rhythm problem can cause death within minutes. Learn the symptoms of VFib and what actions to take to save a life.
Video: An asthma attack
What happens to your airways during an asthma attack?
Video: Ankle sprain
How do you get an ankle sprain? Watch this video and find out.
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.
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