respiratory conditions library

Respiratory conditions impact the lungs and the ability to breath. In this section, find out about the symptoms and treatment of apnea, orthopnea and more.

Featured Article: How Altitude Sickness Works

If you're not acclimated to high altitudes, you may risk nausea, loss of coordination and even fluid leakage into your brain as you ascend. Can you avoid it? See more »

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How Altitude Sickness Works

If you're not acclimated to high altitudes, you may risk nausea, loss of coordination and even fluid leakage into your brain as you ascend. Can you avoid it?

How do Tibetans avoid altitude sickness?

At 16,000 feet above sea level, the average person would get sick from a lack of oxygen. How do Tibetans breathe easily?

How Orthopnea Works

People with orthopnea -- a telltale sign of heart failure -- have trouble breathing when they're lying down. What causes orthopnea?

How Paroxysmal Nocturnal Dyspnea Works

You wake up suddenly, gasping for air, coughing and wheezing. It could be paroxysmal nocturnal dyspnea. What causes it, and how can you treat it?

Is microwave popcorn toxic?

Lots of people love delicious, buttery microwave popcorn. But reports of sick popcorn factory workers and an enthusiastic popcorn lover developing a serious lung condition have people worried.