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Detailed information on immune deficiency disorders in children, including Severe Combined Immunodeficiency, Common Variable Immunodeficiency, DiGeorge Syndrome, and X-linked Agammaglobulinemia

Millions of Americans are affected by age-related macular degeneration, a disease that damages the eye's central vision. To learn more about macular degeneration, take this quiz.

There is an epidemic of obesity in this country, health experts say. But what is obesity? How is it measured?

Here's a tough one: When is an unborn baby most at risk of developing abnormalities?

Crohn’s disease is one of a group of diseases known as inflammatory bowel diseases. Your risk of getting Crohn’s may be tied to family or to your environment. Learn about the risks you may have by taking this assessment.

Answer this one: What position is best for your back when you sleep?

Cardiogenic shock is a type of shock. Shock occurs when the body’s vital organs don't get enough oxygen-carrying blood.

If you wake up often during the night with an urgent need to pee (urinate), you may have nocturia. This condition can affect anyone. But it is more likely to occur as you get older.

Gazing down on the spectacular view from a mountaintop can take your breath away. That breathlessness is oftentimes more than just an awestruck reaction to the sights. It can be a symptom of altitude sickness, an illness that can strike hikers, mountain climbers, skiers and anyone who hits the 8,000-foot mark on a mountain.