Picture of The Esophagus

The esophagus runs behind the windpipe (trachea) and heart, and in front of the spine. The upper esophageal sphincter (UES) is a bundle of muscles ...

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What is a Bilirubin Test?

A bilirubin test measures the amount of bilirubin in your blood. This is the bilirubin created from red blood cell breakdown. This is the bilirubin...

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How Much Vitamin D Do I Need?

Vitamin D has many important jobs in your body. Vitamin D helps the body absorb calcium and phosphorus from the food you eat. Studies show that cal...

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What is Obesity?

Obesity means having far too much body fat. If you're one of them, you can work to lose weight. For adults, experts usually define obesity based on...

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